SLOW COOKER: Beef In Barbecue Sauce

1 Onion Chopped
2 Tablespoons Flour
700g Stewing Beef
397g (14oz) Tin of Chopped Tomatoes
3 Tablespoons Wine Vinegar
1 Tablespoon Worcestershire Sauce
2 Tablespoons Tomato Ketchup
1/2 Teaspoon Salt
1/2 Teaspoon Chilli Powder

1. Blend all ingredients except meat and onion in liquidiser then heat up in a pan and pour over meat and onion in slow cooker.
2. Leave for 6-10 hours.