Saute the oil and chilli powder over medium heat for 1 minute. Add leek, shallot, capsicum and garlic. Saute for 3 minutes. Add the carrots and zucchini. Saute, stirring frequently for 5 minutes. Add the tempeh and saute for 5 more minutes. Add the sherry, tomato and tamari. Saute for an additional 5 minutes.
Put it all into a casserole dish and bake in preheated oven for 30 minutes.