I Want To Pinch His Little Cheeks

My Spanish professor is a cute little thing sometimes. He's from Argentina and has an adorable accent to begin with, but he's even cuter when he makes mistakes. His English is really quite good, which makes any mistakes even cuter. Last night, in discussing some point of grammar or another, he wanted to use the phrase "the meat of the matter". What came out of his mouth was:

"Ah! Now we come to the ham of the sandwich!"