Memphis-Style BBQ Sauce - Martin's Famous Potato Rolls and Bread

Ingredients

• 2 Tablespoons Unsalted Butter
• 1 Small Onion, finely chopped
• 2 Cloves Garlic, minced
• 2 Cups Tomato Sauce
• 1/2 Cup Cider Vinegar
• 1/3 Cup Rice Vinegar
• 1/3 Cup Molasses
• 3 Tablespoons Worcestershire Sauce
• 2 Tablespoons Dark Brown Sugar
• 2 Teaspoons Yellow Mustard
• 1 Teaspoon Louisiana Hot Sauce
• 1 Teaspoon Kosher Salt
• 1 Teaspoon Freshly Ground Black Pepper
• 1/4 Teaspoon Cayenne Pepper