Tomatos and Tomatillos
Tomatillos work as a good substitute for Tomato's in Rajma, and adds a bit of a tangy sour to it. Next time, I'll try this with Chole (which is very similar to Rajma, except that it uses Chick peas instead of Kidney beans. Tomatos are used as the sauce base, and I replaced half of the required tomato with tomatillos here.