It’s the Fourth of July! Let’s have a picnic on this patriotic holiday. I associate All-American hot dogs and hamburgers with Fourth of July celebrations and so I’m making burger sliders for this picnic. Mine are a re-make of White Castle sliders. These are miniature square hamburgers with onions served with a steamed bun. If you’ve never had a White Castle slider, try these substitutes. They are quite tasty little hamburgers.