Hi all I have had great success slow cooking of Jb's base, I fact my results I'm so happy with I will post the method.
Original post and recipe kindly posted by JB here. Link
https://curry-recipes.co.uk/curry/index.php/topic,13136.0.htmlI have followed the recipe with little change, but adding 1 cup or oil at start, the only other difference is after bringing to the boil I then reduced the heat to my smallest flame possible.
Then allowing the base to cook slow for 5-6 hours lid on, occasional stirring is required, also sticking to the times Jb suggests adding ingredients.
Last thing I adjusted was after two hours, I added 5 browned in oil chopped garlic cloves as suggested by many making the base. Then returned to the slow cooking.
Everything was blended after the 5-6 hours, very little effort needed as onions are melted.
This is more economical on amount of gas used and IMO is deep in flavour.
Making Jb's base to spec over 5 times I still fully endorse the original method!
This is only my preference, I share this as my way of squeezing the max I can out of a Gravy.
My Thanks go to Jb for sharing the original method used.