
Makes about 1 quart
2 tablespoons vegetable oil
2 to 3 onions, to taste, finely chopped
3 garlic cloves, minced
1 jalapeño, stemmed, seeded, and minced
1/2 teaspoon hot red pepper flakes
1/4 cup Worcestershire sauce
1/4 cup packed dark brown sugar
1/4 cup granulated sugar
1/2 teaspoon dry mustard
3 cups ketchup
Kosher salt and freshly ground black pepper to taste
Heat the oil in a large saucepan over medium heat. Add the onions and cook, stirring, until softened, about 5 minutes. Add the garlic, jalapeño, and pepper flakes. Stir until fragrant, about 1 minute. Add the Worcestershire sauce, brown sugar, granulated sugar, and mustard. Reduce the heat to medium-low and cook until slightly thickened, about 10 minutes. Stir often to prevent scorching. Pour in the ketchup; add 2 cups cold water, and cook, uncovered, stirring often, until thick, pulpy, and dark red, about 40 minutes. Season with salt and pepper.
Variations: Add 1 seeded, deveined, and finely diced habanero pepper to the sauce as it is cooling. Substitute maple syrup for one of the sugars. Finish with chopped fresh rosemary, sage, or thyme.