I pre prepare my ingredients for my curries to save time.

10 frozen garlic cubes
10 frozen ginger cubes
2 onions fine diced.
half a green pepper fine diced
pinch of salt
enough water to cover
simply simmer for about 20 minutes allow to cool drain off excess water divide into about 8 portions and freeze

I use these for my initial fry off in most curries, as the ingredients are ready cooked I can avoid burning my garlic etc.
I use the water in base gravy .