Hi Folks,
A couple of weekends ago I spent a Saturday morning in a IR here in Brisbane with the Chef/Owner watching him make is base gravy.
He used 12kg dried onions, which would probably equate to 24+kg fresh onions. After cooking the onions and then adding spice powders and tomato paste after 3 hours cooking, he then blended to his desired consistency, and then added whole spices, which he then left for another hour cooking.
He leaves the whole spices in the base, but removes before they go out to the customer.
Now for that amount of onions, he added only 4-5 black cardamoms, a couple of cinamon sticks and 3-4 star anise.
So I would say be wary of just multiplying out whole spices. From another chef I know very well who works at a Hare Krishna restaurant here, it just doesn't work that way.
Cheers,
Mark