The Best Sloppy Joes

Ingredients

• tablespoons unsalted butter
• medium onion, diced
• green bell pepper, diced
• garlic, minced
• pound lean ground beef
• ounces tomato sauce
• ketchup
• tablespoons brown sugar
• tablespoons Worcestershire sauce
• tablespoon yellow mustard
• tablespoon red wine vinegar
• teaspoon paprika
• of cayenne pepper
• Kosher salt and freshly ground black pepper
• hamburger buns, toasted