In a large skillet over medium heat, cook the ground beef for 10–12 minutes or until no longer pink.
While the beef cooks, wash and dice the red bell pepper. Add the diced pepper to the skillet and cook for another 4 minutes, or until softened.
Stir in the tomato paste, ketchup, brown sugar, vinegar, Worcestershire sauce, salt, and black pepper until combined. Reduce the heat to low and simmer for 5 minutes, or until hot and bubbly.
If using gluten free buns, heat a separate skillet over low heat and melt 1 tablespoon of butter. Place the buns cut-side down into the butter and toast until golden brown. Watch carefully because gluten free buns can burn quickly.
Spoon the sloppy joe mixture onto the toasted buns and serve immediately.
Notes
Note 1: Ketchup needs to be low FODMAP. Be aware of high fructose corn syrup. Simply Heinz is one of my favorites but it has onion in it. Try Smoke and Sanity's low FODMAP ketchup for a certified option. Gluten Free Notes:If making for someone with a celiac disease or allergy, ensure all ingredients are labeled gluten free. Low FODMAP Notes:Please refer to the low FODMAP section for detailed notes on ingredients. Low FODMAP ingredient information is based on the Monash University Food App and FODMAP Friendly App testing results. Storage Notes:Store leftover sloppy joe meat in an airtight container in the refrigerator for up to four days. Freeze leftovers once chilled in a freezer friendly container for up to four months. Reheat meat in a microwave for 1-2 minutes, stirring halfway in between cooking time.