Here is my curry base that I currently use. It is the result of many years of me attempting to replicate BIR curries. I have tried countless other recipes, countless alternative ingredients, countless alternative methods, etc, but, until someone comes up with a major breakthrough (and I feel sure there must be one!), it is the best I can currently accomplish.
It makes about
2.3 litres of curry base, which is sufficient for about
9 single portion curries.
Ingredients:- 600g brown onions
- 25g fresh garlic
- 15g fresh ginger
- 40g tomato paste
- 175g fresh tomato
- 40g carrot
- 40g green capsicum (or red if you prefer)
- 20g coriander stalks/roots
- 1 heaped tsp curry powder (any decent mild or medium one will do)
- 3 heaped tsp spice mix http://www.curry-recipes.co.uk/curry/index.php?topic=3765.msg34202#msg34202
- 1 heaped tsp salt
- 125ml vegetable oil (or sunflower or canola oil if you prefer)
- 1600ml water
Method:- Wash and coarsely chop all vegetables, tomatoes and coriander stalks/roots
- Place all ingredients (except the coriander, spice mix and curry powder) in a large saucepan
- Cover the pan and bring to a gentle simmer
- Gently simmer for about 60 minutes (or until all the vegetables are soft)
- Add curry powder and spice mix
- Simmer for a further 5 minutes
- Add coriander stalks and allow to cool
- Blend to a soup-like consistency when sufficiently cool
- Use immediately, store in a fridge (for 3 days max) or freeze in suitable airtight containers
Notes:- You can use other onions, if you prefer (e.g. red, white, etc), but I haven't found it makes much difference
- You can try frying/caramelising the onions, etc, in oil, before adding the water, but I haven't found it makes much difference
- You can use coriander leaves, if your prefer, but your base may become a little green coloured
- You can use an alternative spice mix (or any decent curry powder, or individual spices), if you prefer, but the result will undoubtedly be different
- The resultant base should be a pale, creamy, yellow colour and should smell and taste of a pleasant, creamy, mildly spiced onion/vegetable soup, and should not be bitter
Please let me know how you find it if you try it.
Here is a photo of my finished
Curry Base:

Here is a photo of my
Chicken Madras made using my curry base:

My Madras recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3830.0.
Here is a photo of my
Chicken Tikka Masala Phal made using my curry base:

My Chicken Tikka Masala Phal recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=4000.msg36196#msg36196Here is a photo of my
Chicken Dhansak made using my curry base:

My Dhansak recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3869.msg35049#msg35049Here is a photo of my
Chicken Jalfrezi made using my curry base:

My Jalfrezi recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3877.0Here is a photo of my
Chicken Tikka Masala made using my curry base:

My Chicken Tikka Masala recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3999.msg36188#msg36188Here is a photo of my
Chicken Ceylon made using my curry base:

My Ceylon recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3868.0Here is a photo of my
Chicken Korma made using my curry base:

My Korma recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3975.msg35972#msg35972Here is a photo of my
Chicken Vindaloo made using my curry base:

My Vindaloo recipe can be found here:
http://www.curry-recipes.co.uk/curry/index.php?topic=3953.msg35787#msg35787