2 tablespoons unsalted butter
1/2 medium red onion
1 garlic clove
6 plum tomatoes
1/4 cup ketchup
2 tablespoons Dijon mustard
2 tablespoons dark brown sugar
1 tablespoon honey
1 teaspoon cayenne
1 tablespoon Ancho chile powder
1 teaspoon Pasilla chile powder
1 tablespoon Worcestershire
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