This is a simple and delicious springtime recipe from Debora Madison's essential cookbook, "Vegetarian Cooking For Everyone". The traditional trouchia is a specialty of Nice, where slices of it are sold and eaten cold on the street. This is a very versatile recipe. You can substitute almost any green (kale, beet greens, mustard greens) serve this warm, room temperature or cold, as an appetizer or main dish, and at any meal. It even makes a great sandwich filling. The trick to this recipe's success is to cook everything slowly so that the flavors really deepen and sweeten.