An authentic Indian specialty cooked with freshly ground roasted spices, caramelised onions, and aromatic herbs in the traditional style.
Add the oil and onions to a pan and fry gently for a couple of minutes
Add all of the remaining ingredients and bring to the boil. BE CAREFUL HERE, as soon as this starts to boil it will bubble over so keep a really close eye.
Turn down the heat so the sauce is gently simmering and cook for a further 45 minutes stirring gently every 5-10 so nothing sticks
Allow to cool then keep in the fridge for up to 5 days or freeze in portions.