Prickly pear cactus plantation is seen in Tepeteopan, state of Puebla, Mexico January 16, 2020. Picture taken January 16, 2020. REUTERS/Carlos Jasso

Peeled prickly pears are displayed for people to taste during a cactus fruits exhibition in the village of Nilin near Ramallah, in the Israeli-occupied West Bank August 5, 2019. Picture taken August 5, 2019. REUTERS/Mohamad Torokman

Opuntia plants also known as prickly pears are seen near Mallasa in La Paz, Bolivia, February 13, 2019. REUTERS/David Mercado

An opuntia plant also known as prickly pear is seen near Mallasa in La Paz, Bolivia, February 13, 2019. REUTERS/David Mercado

Prickly pears are placed on a "cancha" during harvest time in Til Til, Chile, February 16, 2018. REUTERS/Ivan Alvarado

A farmer uses rubber gloves to pick up prickly pears during harvest time in Til Til, Chile, February 16, 2018. REUTERS/Ivan Alvarado SEARCH "TIL TIL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A prickly pear plantation located next to a rail line used by a train to transport garbage, is seen in a valley of Til Til, Chile, October 5, 2017. REUTERS/Ivan Alvarado SEARCH "TIL TIL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A Palestinian woman peels a freshly picked prickly pear in the West Bank village of Budrus near Ramallah July 15, 2012. REUTERS/Mohamad Torokman (WEST BANK - Tags: FOOD SOCIETY)

A worker walks through a prickly pear farm in the Khanka area, about 30 km (18 mi) northeast of Cairo July 10, 2010. REUTERS/Asmaa Waguih (EGYPT - Tags: SOCIETY AGRICULTURE)

A worker picks prickly pears at a farm in the Khanka area, about 30 km (18 mi) northeast of Cairo July 10, 2010. REUTERS/Asmaa Waguih (EGYPT - Tags: SOCIETY AGRICULTURE)

A man wears a protective mask as he sells nopales (opuntia) in downtown Monterrey, northern Mexico April 28, 2009. A new swine flu virus that has killed 149 people in Mexico was found further around the world on Tuesday and the specter of a pandemic began to hit air travel. REUTERS/Tomas Bravo (MEXICO SOCIETY HEALTH ENVIRONMENT)

A worker picks prickly pears at a farm in Khanka area, about 30 km (20 miles) northeast of Cairo, July 4, 2008. The workers pick the fruit during early morning hours when the plant is still covered with dew, which reduces likelihood of injury from the spikes. REUTERS/Asmaa Waguih (EGYPT)