Traditional falafel is made with chickpeas/garbanzo beans. I have tried making them with rajma (red kidney beans) for a change and served them with ragi/finger millet pitas. Though the pitas were not so fluffy like the ones we make with flour but they tasted good. They actually tasted like bhakris.
Ingredients: Rajma / kidney beans .... 1 cup (soak them overnight) Onions .... 1/4 cup Ginger