I like this question!

If I had to pick my three favourite spices (other than the obvious main ingredients), I would pick:
- garlic (fresh, powdered and bottled)
- fenugreek (particulalry dry leaves) for the savoury flavour and aroma they impart
- coriander (freash leaves added at the end of cooking)
I think all three ingredients add significant flavour and aroma to a curry that are absoultely indispensible in an authentic BIR curry!

Of course, also cardamom seeds, star anise.......
