Place the butter in a large deep skillet over medium heat. (If using a Swiss Diamond Skillet you don't need the butter!) Then add the chopped onions, peppers, and garlic. Saute for 2-3 minutes to soften, then push the veggies to the edges of the skillet and add the ground beef in the center.
Salt the beef and break into small pieces as you stir. Cook until brown, about 5 minutes.
Then add the next 7 ingredients. Stir the mixture and bring to a simmer. Simmer for 10-12 minutes to thicken, stirring occasionally.
Scoop the Sloppy Joe mixture onto toasted buns and serve warm. Eat as is, or top with pickles and/or cheese.