British Prime Minister Boris Johnson speaks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he walks to visit Ann's Cottage Surf Shop in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson wearing a protective mask visits a shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson wearing a protective mask visits a shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson wearing a protective mask visits Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson wearing a protective mask visits Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson elbow bumps at Lemonheads Barber shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson leaves after visiting Lemonheads Barber shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson passes a "We are Closed" sign as he visits Lemonheads Barber shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson is reflected in a mirror as he visits Lemonheads Barber shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson is reflected in a mirror as he visits Lemonheads Barber shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson elbow bumps a business owner during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he looks at a display of cakes and desserts as he talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he looks at a display of cakes and desserts as he talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson looks at a toy tractor before purchasing it, during a visit to a shop inside Lemon Street Market, in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson looks at a toy during a visit to a shop inside Lemon Street Market, in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson looks at a toy tractor before purchasing it, during a visit to a shop inside Lemon Street Market, in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson pays for a toy during a visit to a shop inside Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he looks at a display of cakes and desserts as he talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he looks at a display of cakes and desserts as he talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson reacts as he looks at a display of cakes and desserts as he talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson walks with business owner Kim Mace during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson meets with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson meets with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson meets with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson talks with business owners during his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson talks with business owners before his visit to Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson arrives to visit Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson arrives to visit Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

British Prime Minister Boris Johnson arrives to visit Lemon Street Market in Truro, Cornwall, Britain April 7, 2021. Justin Tallis/Pool via REUTERS

Randa Ammar 63-year-old, picks lemons from her house garden to add them to her herbal drink as many Jordanians seek herbs to enhance their immunity, amid fears over rising number of coronavirus disease (COVID-19) cases, in Amman, Jordan November 4, 2020. Picture taken November 4, 2020. REUTERS/Muhammad Hamed

Randa Ammar 63-year-old, picks lemons from her house garden to add them to her herbal drink as many Jordanians seek herbs to enhance their immunity, amid fears over rising number of coronavirus disease (COVID-19) cases, in Amman, Jordan November 4, 2020. Picture taken November 4, 2020. REUTERS/Muhammad Hamed

A view shows the lemon trees field dried at Bouzid farm, after the clashes, in Ain Zara, Tripoli, Libya, October 28, 2020. Picture taken October 28, 2020. REUTERS/Hazem Ahmed

Social distancing sign is placed on a table between customers amid the coronavirus disease (COVID-19) outbreak at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

A waitress wearing a protective mask and gloves amid the coronavirus disease (COVID-19) outbreak, cleans glasses at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

Social distancing sign is placed on a table at Setouchi Lemon Shokudo amid the coronavirus disease (COVID-19) outbreak in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

A customer drinks a glass of beer next to chairs bearing social distancing signs at Setouchi Lemon Shokudo amid the coronavirus disease (COVID-19) outbreak in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

A chef wearing protective gloves amid the coronavirus disease (COVID-19) outbreak, makes a salad at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

A waitress wearing protective gloves amid the coronavirus disease (COVID-19) outbreak, serves food to customers at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

A waitress wearing a protective mask and gloves amid the coronavirus disease (COVID-19) outbreak, serves food to customers at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

Customers take off their protective masks as they sit at the table next to social distancing signs amid the coronavirus disease (COVID-19) outbreak at Setouchi Lemon Shokudo in Tokyo, Japan June 22, 2020. Picture taken June 22, 2020. REUTERS/Kim Kyung-Hoon

Laila Almounaier squeezes some lemon into a pot as she finishes up the family's iftar meal, which they normally eat with other relatives, on the first day of Ramadan during the coronavirus disease (COVID-19) outbreak in Bellevue, Washington, U.S. April 24, 2020. Picture taken April 24, 2020. REUTERS/Lindsey Wasson

Ruth Alvarez prepares a tea made of passion fruit, ginger and lemon grass picks for her father who has been diagnosed with the coronavirus disease (COVID-19), in the low-income community Monte Sinai, in Guayaquil, Ecuador April 23, 2020. REUTERS/Santiago Arcos

Liliya Nesenyuk, a volunteer from a support group for people with visual and hearing impairments, pours tea with honey and lemon to a homeless man, as the spread of coronavirus disease (COVID-19) continues, in Stavropol, Russia March 29, 2020. Volunteers sew protective masks and cook food at home for the homeless and people in need living in the region. REUTERS/Eduard Korniyenko

Liliya Nesenyuk, a volunteer from a support group for people with visual and hearing impairments, pours tea with honey and lemon to homeless women, as the spread of coronavirus disease (COVID-19) continues, in Stavropol, Russia March 29, 2020. Volunteers sew protective masks and cook food at home for the homeless and people in need living in the region. REUTERS/Eduard Korniyenko

A staff from Chuchu house cuts the edge of an instant lemon tea mix bag for materials to use in one of their products, at their workshop in Dalla township, Yangon, Myanmar, March 4, 2020. Picture taken March 4, 2020. REUTERS/Ann Wang

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

Sculptures made with lemons and oranges are seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard

A sculpture made with lemons and oranges is seen during the 87th Lemon festival around the theme "Parties around the world", in Menton, France, February 13, 2020. REUTERS/Eric Gaillard