Soupe de poireaux et pommes de terre aux champignons sauvages

Soothing, velvety and rich, leek and potato soup is the ultimate comforting winter soup. If you want it to be very green, use small leeks and make sure you use the green part – lots of people throw this away thinking it is no good, but that is actually where the goodness and colour lie. To get rid of the grit and soil caught between layers, cut the leek into quarters lengthways from just above the root to the top – don’t cut through the root. Fan out the layers and swirl them around in a bo