This simple leek gratin is an excellent choice for a dinner party or special family meal. We think leeks are possibly the most neglected vegetable in the us. They are, however, common in europe, and you'll find many recipes using leeks on british and french cooking sites. Because leeks are not used in abundance in the us, they tend to be costly. If you are lucky enough to have a garden with leeks or want to splurge for a special meal, this is a fantastic way to enjoy them. These baked leeks melt in your mouth with the creamy, garlic-infused sauce and rich fontina and parmesan cheese topping. We didn't use a bread crumb topping, but it is certainly an option. Or, toasted almonds or cooked crumbled bacon may be sprinkled over the leeks just before serving for a bit of texture.