"Do you like try strange new food?" = FOOD, STRANGE NEW, YOU LIKE
STRANGER: The English concept of "stranger" (as in an unknown
person) doesn't have a directly equivalent sign in ASL.
Some people sign "STRANGE + PERSON/AGENT" to mean
I don't really recommend that approach, but if you do decide to use
the signs STRANGE and PERSON to mean to mean "someone you
don't know" then you'll want to do a more mild facial
expression. If you are referring to some new weirdo stalking you, then by all means, go ahead and use
the "strange" sign and facial expression.
However, I think it would be good to understand that most of the
time the concept of "stranger" would be conveyed through a different
set of signs. For example:
Example: "DAD, SOMEONE THERE DOOR, don't-KNOW WHO, NEVER SEE BEFORE.
Another way to express the concept of "stranger" (as in someone that
you don't know) is by signing "NEW +