Hi chriswg
"Just a point for the sake of authenticity"
I've never known any BIR and especially TA Kitchens,
preparing potatoes separately for Bombay Aloo or any other Aloo dish.
They simply use a handful of par fried chips, which they have in abundance
as part of the prep for service.
Hardly anything in a BIR kitchen is made totally from scratch, it's more of an assembly of par cooked foods! There just isn't time!
Just like Chicken Tikka, you would be very lucky to get it straight from the Tandoor
as they usually batch cook it and zap it in the microwave for your dish,
Cheers ChewyTikka
Oh, an Omelette is made from scratch ;D