Hi Dafinchycode,
Not sure I'm following the plot here but this is from Chewys pressure base
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Curry Base - 1 Hour - Curry in a Hurry
by mike styne 2 months 1 week ago
Indian Restaurant Curry Base
Pressure Cooked at home in 1 hour
A simple and quick method to make that famous onion gravy (Garabi)
Hi All
Needed a Curry in a Hurry, made this 1 hour Pressure Cooker version.
Lightly spiced, producing a nice neutral flavoured base.
I've been experimenting with Branded powders, keeping it simple, for people just starting out.

What you need for this one
200ml vegetable oil, infused with Tej Patta and Cassia
500 ml of tap water
3kg Onions.
1 medium carrot,
Third medium Green capsicum .
Third medium Red capsicum
A quarter of white cabbage. (Small)
A handful of fresh coriander stalks.
Half bulb of Garlic.
2 inch piece of fresh ginger.
2 Green Chillis
3 tbsp of a tube of tomato puree. (M&S Italian)
1 tbsp of salt.
1 tbsp of Haldi. (Tumeric Powder)
1 tbsp of Bolst Hot Curry Powder.
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Maybe this link will work.
pressurebase2