In my family, rice and peas were made with gungo peas or kidney beans. The ingredients for rice and peas vary from family to family, across the generations and islands of the Caribbean ...
You can get gungo peas (pigeon peas ... then leave to rest for a few minutes. For the rice and peas, heat the oil in a large saucepan or casserole. Add the onion, and fry until soft and translucent.