Finely chop the onion. Seed and finely dice the green pepper. Mince garlic cloves. If using canned tomatoes, puree tomatoes to make sauce.
In a bowl, combine the tomato sauce, ketchup, Worcestershire sauce, mustard, and brown sugar.
Place a large skillet or dutch oven over medium/high heat. Add olive oil and ground beef. Saute the beef for about 5 minutes until cooked through and no longer pink, breaking it up with a spatula. Remove extra fat by draining or with paper towel.
Season with salt and pepper. Add in the diced peppers and onion. Cook another 5 minutes until the veggies are tender and beef is browned.
Add the minced garlic and saute 30 seconds until fragrant, stirring constantly. Add in the sauce and bring to a light boil. Reduce heat to low and simmer uncovered for about 10-15 minutes or until thickened to your liking. Season to taste with salt and pepper and add water if you prefer a looser consistency. Serve on toasted buns for Sloppy Joe Sandwiches.
Suggestions for adjusting taste: Too sweet - add a pinch of salt or ½ tsp of apple-cider vinegar. Too tangy - add ½ tsp brown sugar or a drizzle of ketchup. Too tomatoey - simmer extra 5 min to concentrate flavors and caramelize sugars. Missing depth - add extra worcestershire sauce.
