Sloppy joes

2 tbsp olive oil 400g beef mince 1 onion, finely chopped 1 green pepper, finely chopped 1 tsp garlic granules 1 tsp smoked paprika 1 tsp light brown soft sugar 1 tbsp malt vinegar 4 tbsp ketchup 1 tbsp Dijon mustard or 1⁄2 tsp must