Goku's least favorite food is often depicted as seafood, particularly sushi. He has shown a strong dislike for fish dishes and tends to avoid them whenever possible.
I remember in the dub of the original dragon ball when he faced off with Rabbit villian, Goku said he didn't like carrots all that much
crab and eel
Jewish food
His favorite food is steak... so the opposite of steak?
pizza
cookies
raisins
I'm not so sure about what exactly IS her least favorite food but she is deathly allergic to Lobster if she eats it she will go into a coma.
Tuna Fish Sandwiches. Reference: Me: Victor What is your least favorite food? Victor Cruise: Tuna Fish Sandwiches
Taco Bell.
PICKLES
burgers
MEAT