Slice the onions and place in a large cooking pot with the spice mix and tomatoes.
Add 1500mls of warm water and the oil and bring to a boil, once boiling simmer for 1 hour.
Blend using a hand blender into a smooth sauce, simmer for a further 10 minutes, skim off any excess oil (optional).
Use 2 ladles of sauce to cook each curry.
Each box contains enough Spices and to make this curry 4 times over.
To make a curry for 2 people the following additional ingredients are required:
- Six medium onions
- 1/2 tin of chopped tomatoes
- 100mls of oil