In a large skillet, heat olive oil over medium heat. Saute the pepper and onion until softened, 1 to 2 minutes. Stir in the garlic salt. Add the BBQ sauce and bring to a boil. Reduce the heat to a low simmer and add the chopped meat.
Meanwhile, fill a large pot with water and bring to boil. Season liberally with salt and add spaghetti. Cook until al dente (firm but not hard), about 7 minutes, and drain. Toss spaghetti with sauce.
In a medium saucepan, combine all ingredients. Bring mixture to a boil, reduce heat to simmer. Cooked uncovered, stirring frequently, for 1 hour 15 minutes.