Southern Sloppy Joe Sliders

Name: Southern Sloppy Joe Sliders
Ingredients: 2 tablespoons coconut oil; 1 medium red bell pepper, medium diced; 1 medium onion, medium diced; 1 1/2 pounds ground beef or ground meat substitute (soy crumbles); One 6-ounce can tomato paste; 1/4 cup bourbon; 3 tablespoons soy sauce; 2 tablespoons apple cider vinegar; 2 tablespoons whole-grain mustard; 2 tablespoons sorghum syrup; 2 teaspoons ground cumin; 2 teaspoons liquid smoke; 1 teaspoon crushed red pepper flakes; 3 cloves garlic, chopped; 12 slider buns; Unsalted butter, for toasting buns