You also have to add Chinese 5 spice into the recipe!
Here's how I do it..
Fry off any veg and the meat in frylight. Add one can of diet coke, 5 tbsp passata, 1 clove of garlic, 1 tsp sweetener and 5 tsp of Chinese 5 spice. Leave to simmer for around 20 minutes or until the sauce thickens.