How do I make a squirrel barf

Hint 1 of 5:

Show it something really disgusting.

Hint 2 of 5:

What's the most disgusting thing you've experienced ?

Hint 3 of 5:

SHOW CASSEROLE TO SQUIRREL.

Hint 4 of 5:

GET VOMIT.

Hint 5 of 5:

In Spellcasting 301, maybe we'll learn to make a woodchuck upchuck ?