Hi Sp
I'll try and put this to bed. Garam Masala is ambiguous, like so many written terms and definitions.
Firstly my BIR kitchen knowledge is real and of Bangladeshi/Bengali kitchens, which are probably 80% of the UK BIR's.
The four main Whole Garam Spices used daily, both in a Bengali Home and Restaurant are 1.Tej Patta or Indian Bay Leaves, 2.Hari Elaichi or Green Cardamom, 3.Laung or Cloves, 4.Dalchini or Cassia Bark. These are used whole, in various preparations for taste and aroma i.e for flavouring precooked meats. precooked chopped onions, and precooked chunky vegetables, although some chefs favour Bengali five spice (Panch Phoron) for the latter and not forgetting rices and some sweets.
Bengali BIR Garam Masala.
The same whole Garam spices, 1234 when ground and combined, produce a Garam Masala Powder, which a Bengali BIR chef will use a pinch of to provide an aromatic finish to any particular curry dish he cooks, usually Bhuna or Karahi style, it really is chef dependant.
So when you pass a Bengali BIR or Bengali home and smell that distinct aroma, these 4 aromatics are a main part of that.
These are the main 4 Garam spices preferred by Bengalis, plenty of other spices are used in there cooking
but these 4 are fundamental and always have been. for Bengalis Anyhoo.
cheers Chewy