Depends on the filling. Something with big pieces of meat or big strips of chilis is going to be tough. Just masa and cheese would be easy.
Not picking on the dog, but Taco Bell bean burritos used to be at least twice as big as they are now.
It's a secret thing that I may or may not be into and don't normally tell people about. So I abstain from your poll, respecfully.
Biting and chewing are two different things. The question was about chewing. Synonyms for biting: cutting, piercing, tearing. Synonyms for chewing: grind, crush, gnaw, masticate.