There is only one word that rhymes with tastiest, and that is 'hastiest'.
But there are some words that are near-rhymes:
the only word vaguely connected to food that would rhyme is tastiest
the tastiest food is definitely pannacotta
Vagina of a girl. Boys tasted it and approved that it is the tastiest fruit.
it is a bolony
when they are red!
Siruvani water of Coimbatore is the world's tastiest water
the most tastiest snowball is the dog pea snow its really salty you should try it..../...awsome
its the bull
candy kite
old MacDonald
pufferfish
Classic Chocolate Chip