Ingredients:

• 4 tablespoons butter (can substitute vegetable oil)
• 1/2 onion, grated
• Kosher salt, to taste
• 1 to 4 chipotle chiles in adobo (depending on how hot you want your bbq sauce)
• 1 (15-ounce) can crushed tomatoes
• 1/2 cup cider vinegar
• 1/4 cup molasses
• 2 tablespoons brown sugar
• 1 teaspoon liquid smoke
• 1 tablespoon finely chopped fresh sage