This has to be just about my favourite Indian dish to make, and I make it a lot! It's also one of the few recipes that I make exactly as written! I sometimes vary the ingredients by substituting the potatoes with carrots and sweet potatoes (but then of course it's not Rasadar aloo anymore!), or by adding extra tomatoes. You may wish to use less oil, but the spice mix is perfect (and I never change it). If you've never used asafoetida before, don't be put off by the slightly strange smell; the results are worth it. This recipe comes from "The Complete Indian Cookbook", edited by Meera Budhwar and I'm posting the ingredients specified. You can easily scale the quantities up but I think this serves 2 as a main dish or 4 as a side dish.