These mushrooms are cooked with lots of butter and herbs and then served warm with the most soothing topping. You can prepare the mushrooms and barley ahead of time, then heat them up and add the lemon, feta, and herbs at the last minute. Try your hand at preserving lemons if you have the patience. Otherwise, seek them out at a shop or online site specializing in North African food.
Yotam Ottolenghi owns an eponymous group of four restaurants, plus the high-end restaurant, Nopi, in London. He writes for The Guardian, and appears on BBC. Sami Tamimi is a partner and head chef at Ottolenghi. Authors of the New York Times bestseller Jerusalem and the runaway hit Plenty, they have been featured in the New York Times, Saveur and the Los Angeles Times. They Live in London.