"This is the farm," Sierra Alea said. "This is how to eliminate food waste from landfills," Alea said. That's the idea behind Afterlife Ag, the mushroom-growing startup of which she is a co-founder. Winson Wong, another co-founder of Afterlife Ag, said that 80 to 85 percent of what is thrown away in a restaurant is "prep waste, " material like egg shells, lemon wedges and tomato peels. Afterlife Ag's model [is] picking up restaurant waste " not the scraps that customers had left on their plates but discards from the chefs who had prepared their meals " and returning with mushrooms. Soon Afterlife Ag was involved in the intricacies of farming and creating substrate in which to grow mushrooms, sometimes with wood chips or shavings from sawmills, sometimes with sawdust from purveyors that smoke fish, sometimes with hemp from hemp farms. "Food waste varies from day to day," said Aaron Kang, the head grower at Afterlife Ag. Afterlife Ag harvests mushrooms every day and packs them in five-pound boxes for delivery to its restaurant clients. It also sells to schools and hospitals. At one of the restaurants " State Grill and Bar, at 21 West 33rd Street, in the Empire State Building " the chef, Morgan Jarrett, made four dishes with ingredients from Afterlife Ag, starting with a mousse made from pink oyster mushrooms and black king trumpet mushrooms, topped by jangajji, a type of pickled mushroom.