CA, my thoughts...
QuoteSmall scale (rather than large scale) curry base
Agree with this. I don't recall any home experiments with a 60L pot. I'd be personally surprised though if this made a noticeable difference over a typical "large" base posted on cr0.
QuoteShort cooking times (rather than extended cooking times) for the curry base
Also interesting to understand is what they do with the base at the end of day... is it left to sit overnight? Do they ever just "top it up"?
Small volumes (rather than large volumes) of dish preparation
QuoteLow power heat sources (rather than high power)
I and others that I recall have used high heat sources to cook curries in similar times to those observed in a BIR. I am curious though the BTU's of a typical BIR gas range compared to high powered home ranges, and those standalone outdoor gas rings.
QuoteUse of frozen curry base (rather than unfrozen)
Use of frozen garlic, ginger and tomato paste (rather than unfrozen)
I've rarely used frozen g/g so couldn't comment on the difference. However I can say for sure that when I went from freshly grating/mincing ginger and garlic to pureeing a mix with oil, that my curries improved dramatically. I'd never go with fresh mince again.
QuoteUse of frozen coriander (rather than unfrozen)
Slow usage of spices (rather than high usage)
Availability of nicely impregnated spice infused oil
Ahhh - the old/spiced oil argument. I honestly can't say one way or the other which is closer to BIR - with spiced or unspiced oil, having tried both over the years. I think though that there is enough video evidence to say its not a standard practice, and I've not seen reports that say those curries cooked with fresh oil are any less "BIR".
-- Josh