Ingredients
- 4 tablespoons (½ stick) unsalted butter, plus ½ cup (1 stick) at room temperature, divided
- 1 medium red onion, chopped
- Kosher salt, freshly ground pepper
- 2 tablespoons tomato paste
- 2 28-oz. cans crushed fire-roasted tomatoes
- 4 cups vegetable broth
- 2 sprigs thyme
- 1 bay leaf
- 2 tablespoons sugar
- ½ cup heavy cream
- 16 slices Pullman loaf
- 16 ounces cheddar, grated
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