My dear friend, Ngan, introduced me to this dish. It is very versatile, and you can use any veggies you have on hand. For this dish, I used eggplant and sweet potato, but I've done many other variations in the past. Potato/carrot, for that day when you have no other veg in the house, and one of my favorite combos is pumpkin/carrot. Pumpkin or butternut squash comes out very rich and creamy tasting in a curry, but it is a bit of a struggle to chop it up uncooked.