Ingredients
Method
Melt ½ cup (1 stick) unsalted butter in a large saucepan over medium heat. Add 2 medium onions, finely chopped, and 2 sprigs thyme; cook, stirring often, until onions are soft and translucent, about 10 minutes. Add 2 Tbsp. all-purpose flour; stir constantly for 3 minutes.
Add 1 (28-oz.) can crushed tomatoes with juices; cook over medium heat, stirring occasionally, until thickened and flavors meld, about 30 minutes. Discard thyme. Stir in ⅓ cup thinly sliced scallions, 3 Tbsp. heavy cream, and ⅛ tsp. cayenne pepper. Season to taste with kosher salt, freshly ground black pepper, and more cayenne, if desired.
