BBQ meatball subs

Name: BBQ meatball subs
Ingredients: 250g 12% fat beef mince; 250g pork mince or sausagemeat; small handful of parsley, finely chopped; 1 tsp garlic granules; 25g fresh breadcrumbs; 6 hot dog buns; 100g grated mozzarella or cheddar (or use a mixture); 1 tbsp olive oil, plus extra for brushing; 2 garlic cloves, crushed; 400g can chopped tomatoes; 2 tbsp barbecue sauce; 1 tsp dried oregano; 1 tsp caster sugar