Last night I managed to watch the chef prepare his pre cooked mushrooms.It was quite simple,and he used a similar technique to cook his mixed veg last week.Hopefully I'll catch him doing his pre cooked potatoes soon,he told me that they were done in the same manner.Anyway this is how he did his mushrooms.
First,he had a big container of chopped mushrooms which were blanched in water(.I'm guessing about 3 kilos).Then in a big pan he put in a chef's spoon of mixed veg oil/ghee.He heated this then added a spoon of blended ginger garlic together with a spoon of blended plum tomatoes.In the pan went half a spoon of cumin powder and the same of turmeric.Also added was about a quarter of salt and a teaspoon of panch poran.This was cooked for about 5 minutes max and then transferred to a big tray under the counter.
The mixed veg was done in a very similar way,the same ingredients but with a little water added and the veg added at various times depending on their cooking times.The potatoes are also done this way,but instead of panch poran added the chef adds cumin seeds.Neither the mix veg or potatoes are blanched beforehand.