Having looked at CBM(Mick)'s e book he uses 1 tbsp of turmeric (and similar amounts of coriander and cumin) in his base in book 1 with only 750 grms of onions, BUT, there are several other ingredients to mask the smell/flavor as opposed to Taz's base which is just turmeric, coriander and cumin, so it may just be that??
Ed