Produce, including blueberries and rhubarb, are seen at Amber Waves Farm in Amagansett, New York, U.S., July 2, 2019. Picture taken July 2, 2019. REUTERS/Lindsay Morris

Britain's Prince Charles (C) serves rhubarb crumble, watched by chef Jamie Oliver (L), during a visit to the Carshalton Boys Sports College, south of London November 26, 2012. The aim of the visit was to see how the school had transformed its approach to healthy eating through a series of measures put in place by headteacher, Simon Barber. REUTERS/Arthur Edwards/Pool (BRITAIN - Tags: ENTERTAINMENT EDUCATION SOCIETY ROYALS)

A bowl of rhubarb and almond trifle is photographed in Canteen restaurant in London, May 24, 2012. A menu of oddly named and sometimes oddly tasting traditional British dishes awaits adventurous diners visiting London for the Olympic Games this summer. Picture taken May 24, 2012. REUTERS/Suzanne Plunkett (BRITAIN - Tags: FOOD SPORT OLYMPICS)

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Biscuits (clockwise from top L), battenberg cake, rhubarb and almond trifle, and an Eton mess are seen in this combination photograph taken June 13, 2012. A menu of oddly named and sometimes oddly tasting traditional British dishes awaits adventurous diners visiting London for the Olympic Games this summer. REUTERS/Suzanne Plunkett (BRITAIN - Tags: FOOD SPORT OLYMPICS)
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Pie and Mash Club members Stuart Frost (R) and John Leach eat rhubarb crumble with custard for pudding at G. Kelly's pie and mash shop in east London June 1, 2012. Each month the club get together at a different, traditional pie and mash shop and competitively eat as many eels, pies, mash, liquor (parsley sauce) and pudding with custard as they can. Points are scored for each item completely eaten and points are deducted for ringing mobile phones or vomiting. Photograph was taken June 1, 2012. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY)

Pie and Mash Club member John Leach (L) drinks a cup of tea while Nick Evans eats a rhubarb crumble for pudding at G. Kelly's pie and mash shop in east London June 1, 2012. Each month the club get together at a different, traditional pie and mash shop and competitively eat as many eels, pies, mash, liquor (parsley sauce) and pudding with custard as they can. Points are scored for each item completely eaten and points are deducted for ringing mobile phones or vomiting. Photograph was taken June 1, 2012. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY)

A jar of homemade rhubarb jam is seen during a Lex Eat brunch at an apartment in London, March 5, 2011. Secret supper clubs -- word of mouth dining clubs usually in people's homes -- have been springing up all over London in the last two years, providing adventurous foodies with the chance to eat in intimate and very personal settings. Picture taken March 5, 2011. To match Reuters Life! FOOD-DINING/SECRETSUPPERS REUTERS/Simon Newman (BRITAIN - Tags: FOOD SOCIETY)

U.S. first lady Michelle Obama plants a rhubarb as she hosts the spring garden planting in the White House kitchen garden in Washington, March 31, 2010. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS)

U.S. first lady Michelle Obama (R), White House Chef Sam Kass (R) and school children dance around a rhubarb they had just planted during the spring garden planting in the White House kitchen garden in Washington, March 31, 2010. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS)

U.S. first lady Michelle Obama dances with children around a rhubarb after planting it with them as she hosts the spring garden planting in the White House kitchen garden in Washington, March 31, 2010. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS SOCIETY AGRICULTURE)

Robert Patterson of the Food And Agricultural Organization for the United Nations discusses various crops near some rhubarb on Randall's Island during the 2007 "Farm Aid" concert in New York September 9, 2007. REUTERS/Lucas Jackson (UNITED STATES)