Pondering the LD-50 of curry

i've been pondering a fantasy setting where dragons like making really big curries. maybe that's a channel to test this

curries spicy enough to outright kill a human.
curries using a spice that's lethal to humans but doesn't affect dragons at all
curries so tasty the ld50 is for "how much do you eat before you refuse to ever eat anything else"

curry that's all of the three and the combined synthesis is that if it doesn't kill you it turns you into a dragon

My curry is too strong for you traveller, its fire is such that it would burn a dragon let alone a man, you need to find a weaker curry seller

forbidden dragon curry...