Bat-Mite is grossed out over the taste of Peanut butter and sardine pie.[1]
A pie was a pastry dish which could be made in a variety of ways.
Many pies were made with fruit fillings as the ingredients, such as apples, cherries and even pumpkins.
Dick Grayson often baked a Peanut Butter and Sardine pie at Wayne Manor, although Bruce Wayne and Bat-Mite never liked to eat them. Although Bruce was happy when the pie he disdained eating was enough to make Bat-Mite leave back to his homeworld.[2]