What do I feed my pet leprechaun?

Today I went to the exotic pet store in my neighborhood. They had a sale on leprechauns so I bought one. I bought a collar and leash so I can take him on walks, as well as some squeaky toys for him to play with. Also, I bought a crate to keep him in until he is potty trained. But I forgot to buy food and I’m not even sure what leprechauns eat.