Spicy Tomato Soup With Grilled Cheese Croutons
INGREDIENTS
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2 tablespoons extra-virgin olive oil
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1 small yellow onion, peeled, halved, and sliced thinly
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1 teaspoon red pepper flakes
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2 (28-ounce) cans whole tomatoes
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1 1/2 cups water
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1/4 cup loosely packed fresh basil leaves, plus more for garnish
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About 2 teaspoons kosher salt, or to taste
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About 1 tablespoon balsamic vinegar, or to taste
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4 (1/2-inch-thick) slices rustic white bread
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2 tablespoons unsalted butter, melted
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4 ounces Gruyère cheese, grated
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Neutral oil, such as grapeseed or canola
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Freshly ground black pepper
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