Soup
3 pounds plum tomatoes, halved lengthwise
2 tablespoons olive oil
2 large or 4 small cloves garlic, unpeeled
1 teaspoon finely chopped fresh thyme leaves or 1/4 teaspoon dried
1/4 teaspoon (or more to taste) dried crushed red pepper
4 cups chicken or vegetable stock

Lid
4 1-inch slices from a large loaf of rye bread, whole wheat sourdough or bread of your choice (or 16 1-inch slices from a baguette), toasted until hard and lightly buttered on one side
1 tablespoon grated raw onion
1 cup coarsely grated cheddar (or more to taste)