This is my favourite sloppy joe recipe. It is Rachel Ray's and you can get montreal steak seasoning at sainsbury's. I've also used canned tomatoes instead of the sauce and it works as well.
http://www.foodnetwork.com/food/cooking/recipe/0,,FOOD_9936_23182,00.html1 tablespoon extra-virgin olive oil, 1 turn of the pan
1 1/4 pounds ground beef sirloin
1/4 cup brown sugar
2 teaspoons to 1 tablespoon steak seasoning blend, such as McCormick brand Montreal Seasoning
1 medium onion, chopped
1 small red bell pepper, chopped
1 tablespoon red wine vinegar
1 tablespoon Worcestershire sauce
2 cups tomato sauce
2 tablespoons tomato paste
4 crusty rolls, split, toasted, and lightly buttered