Summer Tomato Sauce

• 1 onion, roughly chopped or minced
• 8 tablespoons/115 grams unsalted butter

Method 1: In a high-sided pot, sweat the onion in a little of the butter until softened, seasoning with salt. Put the onion, remaining butter, and tomatoes in a blender and puree. Pour the sauce into the pot and simmer over low heat for 1 hour.

Method 2: Preheat the broiler. Put the tomatoes, cut-side down, on a rimmed baking sheet and broil till they’re charred. Meanwhile, in a high-si