1/2 pound stale bread, sliced about 1/2 inch thick (see note below)
1 large garlic clove, cut in half, green shoots removed
2 ounces Gruy?re cheese, grated (1/2 cup)
1 ounce Parmesan cheese, grated (1/4 cup)
1 pound firm, ripe tomatoes, sliced
Salt and freshly ground pepper
2 teaspoons fresh thyme leaves
2 teaspoons chopped fresh rosemary
4 large eggs
1/2 teaspoon salt
2 cups low-fat milk
Note: If bread is too hard to slice, dip it in the milk for about half a minute, then cut it.
Preheat the oven to 350 degrees. Oil or butter a two-quart baking dish or gratin. If the bread is soft, toast it lightly and rub all the slices, front and back, with the cut clove of garlic. (If it?s hard and stale, just rub with garlic.) Mince what garlic remains. Combine the two cheeses in a small bowl.
Layer half of the bread slices in the baking dish. Top with half of the tomato slices. Sprinkle the tomato slices with salt and pepper, then with half the thyme and rosemary and half the remaining garlic. Top with half the cheese. Repeat the layers.
Beat together the eggs and milk. Add 1/2 teaspoon salt and a few twists of the pepper mill, then pour over the bread and tomato layers. Place in the oven, and bake 40 to 50 minutes until puffed and browned. Remove from the oven, and serve hot or warm.
Advance preparation: This can be assembled through step 2 a few hours before beating together the eggs and milk and completing the casserole.
Any other seasonal vegetable can be substituted for the tomatoes.