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Ingredients

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• 3 tablespoons (45 grams) unsalted butter
• 2 medium white onions, diced (about 2 1/2 cups)
• 3 garlic cloves, thinly sliced
• 4 tablespoons tomato paste
• 1 tablespoon (15 ml) sherry (optional)
• 1 1/4 pounds (565 grams) cherry or grape tomatoes, halved (from 2 10-oz packages)
• Kosher salt, freshly ground black pepper, and red pepper flakes
• 3 cups (710 ml) vegetable or chicken broth
• 1 to 2 teaspoons (5 to 10 ml) sherry vinegar to finish (optional)
• 1/4 cup (60 ml) heavy cream, or more to taste