A good, adaptible meal.
Serves 8, takes about 1.5-2 hours
Parboil the courgettes, parsnip and sweet potato. Meanwhile, heat the oil and the spices (not the garam masala, that comes later). Add the onions and cook for a bit, then the mushrooms, and after a little while add the wine, vinegar, mushroom ketchup and chutney. You should have a nice brown oily paste by now. Drain the veg and add it to the paste. Stir. Add in the yoghurt and tomatos, cook for about an hour, stirring from time to time. Stir in the garam masala a few minutes before serving.
This goes well with rice. Red wine is also good - if you can find it, Vina Albali (a Tempranillo from Valdepenas) is pretty good.
You can control how hot the curry is with three key spices. Black peppercorns (ground) add immediate "bite" to the curry, and mustard seeds put heat in after that. Finally, chillies add long-term, slow-acting heat. However, you don't need to add any heat at all. Mild curries can still be tasty and aromatic, and you can serve them to a wider range of people.