Wintery mix and snowy weather call for comforting foods like this Winter Greens and Butternut Squash Gratin. This cozy casserole is great as a side dish or filling enough for a plant-based main course. Winter squash are earthy, creamy, and rich – the definition of a satisfying supper. Continue reading for information on how to tell the difference between the varieties — from pumpkin and butternut to acorn —  how to clean, cut, and store, and a collection of great recipes.