Sloppy Joes

This recipe came from the pioneer woman...it is delish!
Ingredients
2 Tablespoons Butter
2-½ pounds Ground Beef
½ whole Large Onion, Diced
1 whole Large Green Bell Pepper, Diced
5 cloves Garlic, Minced
1-½ cup Ketchup
1 cup Water
2 Tablespoons Brown Sugar
2 teaspoons Chili Powder (more To Taste)
1 teaspoon Dry Mustard
½ teaspoons Red Pepper Flakes (more To Taste)
Worcestershire Sauce To Taste
2 Tablespoons Tomato Paste (optional)
Tabasco Sauce (optional; To Taste)
Salt To Taste
Freshly Ground Black Pepper, To Taste
Kaiser Rolls
Butter
Preparation Instructions
Add butter to a large skillet or dutch oven over medium high heat. Add ground beef and cook until brown. Drain most of the fat and discard.
Add onions, green pepper, and garlic. Cook for a few minutes, or until vegetables begin to get soft.
Add ketchup, brown sugar, chili pepper, dry mustard, and water. Stir to combine and simmer for 15 minutes, adding salt and pepper to taste. Also add tomato paste, Worcestershire, and Tabasco if desired. Taste and adjust seasonings as needed.
Spread rolls with butter and brown on a griddle or skillet. Spoon meat mixture over the rolls, topping with a slice of cheese if it makes your skirt fly up.