1 pound zucchini or summer squash, peeled and thinly sliced 1 pound combined of fennel and leek, rinsed and drained, and thinly sliced 6 tablespoons olive oil or unsalted butter 1 large onion, chopped 2 garlic cloves, finely chopped (optional) 2 cups milk, stock, or cooled vegetable cooking liquid ¼ […]