Grind the tomatoes, ginger and green chilly to a fine paste. Wash and soak the chickpeas overnight. I had made a mintpulao without using onion and garlic once for a get together during navaratri
If you are not able to find these beans, you can do it with other variety of beans like butter beans and rajma beans, or if none of them are available, you can use our good old greenpeas too