Parsnip in stews. Yes I can still taste it, Mum, and no it is not potato.
Chilli - I can cope with the tiniest amount but the second my mouth starts to burn, fuckit. This includes all other "heat-making" spices as well, to be fair.
Tomato (now) - gives me severe acid reflux and sometimes IBS as well, even the smallest amount of tomato paste.
Stevia - yes I can taste it, it tastes like aspartame residue to me, no I cannot eat it.
Aspartame - just no.
Peanuts - no I'm not allergic, I just don't like them and I can't be doing with them in any meal, but especially not sweet stuff. (Hangover from being fed peanut brittle on long car journeys --> vomiting everywhere)
BUT I will happily eat olives, capers, dill pickles, mild mustard, celery, fennel, coriander and all manner of other things mentioned here!
My children though - DS1 is like me with the pickle things, DS2 won't touch them at any price. Neither of them will eat large pieces of cooked onion or mushroom (slimy) so onion and mushroom get minced down to tiny tiny pieces. They don't dislike the flavour, just the texture (I get this, I won't eat semolina, fried egg white or raw oysters) but since they eat all their veg usually and most other things, I do tend to "pander" to their dislikes. Of course, they've never tried parsnip though! 