Mâche…corn salad…lamb’s lettuce is a mild-flavored salad green that you can serve alone or as a counterpoint to strong-flavored greens such as arugula and chicory. Mâche (say ‘mah-sh’) can also be steamed and served as a vegetable. Mâche has a sweet, slightly nutty taste. Its flavor is so subtle that you’ll need to pay attention…