When you make the base you can skim some of the oil off the top before blending.
As for base sauce, the last one I made I added 2 stalks of celery and it was the best base sauce I have made to date. You don't often see celery in online recipes and I'm not even sure where I got the recipe from now, i'll have to have a look to see if I still have it.
I also make my own curry powder by buying whole spices, toasting them in a hot pan and then grinding them into powder. Including bay leavers, cinamon bark etc. So much better than shop bought powder, even the good stuff like Natco etc. Also smells AMAZING when you're toasting all the spices.
So for seasoned oil I use Steven heap's seasoned oil. I would say this was a major step forward for me. The curries I have made have been so much better. Before using it I would say I was about 40% there, this took me to %70. Also what I do is use the seasoned oil for the base, then skim extra oil at the end, this is effectively double seasoned oil.
It makes sense when you think about it. Restaurant or takeaways don't like to waste anything, waste = money so that's a fact. BIR restaurant's are setup to make money, so everything on that menu is chosen to make profit, nothing wrong with at all, just good business. So all the pakoras, onion bhajis and whatever else require spices to make them tasty. Now spices cost money. So the oil that this is all getting fried in has now lots of spiced flavour infused. What to do with it, throw it away? If think not, oil is also expensive but more than that you have deeply infused flavour right there. So I think its a fact that most places will re use this oil to make there base and curries so that there not wasting precious oil and using less spice in the final dish.
https://www.youtube.com/watch?v=nxydx87kpas
All this talk of recipes and no one has posted any. Come on lets see some favorite base sauces and overall curries. I tend to just wing it when making curries, see what spices ive got, usually start with some blended up onion and a tin of chopped tomatoes and go from there.
My main flavors tend to be the actual fresh chilies i use, be it scotch bonnet or naga.
Some restaurants i find using the base sauce approach just all taste the same, just hotter versions of each other. My wife was particularly fond of a karahi but since closing down have never found one like it. It was rather sweet and dark, others tried since just taste like a typical bhuna or generic tomato flavored curry.
So this was best base gravy I ever made.
Ingredients:
Base veg
200ml seasoned oil,
https://www.youtube.com/watch?v=nxydx87kpas
10 chicken thighs de-boned and skinned, use the bones and skin keep the flesh for something else
Enough onions sliced to fill a 3L pot
2 carrots chopped
3 green chilies chopped
2 bay leafs
1 large stick cinnamon. (try to get cassia bark)
1 big bunch of fresh fenugreek chopped rough or methi leaves (you can get them in morrison's) if not using use 1 tbsp kasoori methi.
4 tbsp garlic/ginger paste.
Stalks of a big bunch of corriander choped rough, keep the leaves for something else or add to gravy your choice.
1 tsp salt
Spiced base
200ml seasoned oil,
https://www.youtube.com/watch?v=nxydx87kpas
seeds from 2 black cardamon
seeds from 4 green cardamon
1 tbsp coriander seeds
1 tbsp cumin seeds
1 tsp tumeric
4 cloves
10 black peppercorns
2 kashmiri chilies
1 tbsp tomato puree
1 tin of tomatoes.
Method
Add everything from base veg section in a 3L pot cover everything water. Cook on medium heat for 1 hour, onions should be melted. Once done remove bay leaf, cinnamon, chicken bones and skin, leave with lid on to cool for 3 hours.
Grind all the spices until you have a course powder, go fine if you want. set aside.
Heat oil in a separate pan, add tomato puree cook for a few mins, add tin tomatoes, cook until well cooked and sweet, not too high heat.
Add you all your spices, keep your heat low, cook until the oil is oozing out again.
Add spiced base to base veg and bring back to boil, simmer on low heat for 30 mins. Taste it should be fairly sweet if not cook it more.
Blend to your desire.
I will add some curries I made later.