I did try a Phaall once - in Oxford @ 25 years ago - it nearly blew my ears off. Waaaay too hot to taste whatever you are eating.
Mate of mine 50 years ago - for his stag night - we ended up in the old Taj restaurant on Princess Street in Manchester. Petes his name and he was on leave from Army duty in Yemen at the time. He asked the waiter for his hottest dish - 'It's a Phaal, Sir'. 'Ok I 'll have a chicken phaal please' sez Pete. Now, in this place, I could just about handle the Madras - it was hotter than most BIR vindaloos. As the meal progressed, Pete ordered 2x large jugs of ice cold water (as well as lagers) & with copious sweat pumping off his brow he finished it all. The waiter duly appeared and asked how he rated the meal. 'Bloody fantastic' said Pete. Looking at the state of him - the waiter then said ' Bloody good job we didn't give you the Phaall sir - that was the vindaloo !'