"Mashuga nuts" is a registered business mark held by Torn Ranch for pecans baked in a cinnamon-spiced meringue.
The name is a play on words. "Mashugina" is a Yiddish word for "nuts," as in "crazy."
In The One With the Red Sweater, Rachel and Phoebe get upset upon seeing Mashuga nuts listed on their hotel bills. Joey had secretly stolen the nuts from their mini-bar.