Vegetable oil for frying Scrub all vegetables and dry. Heat oil in karahi. Saute onions until transparent: add turmeric, garlic and chopped dried chilies, and saute for another minute (be careful not to let the garlic scorch), then remove onions and garlic and set aside. Reheat oil slightly. Slice half the zucchini/courgette into rounds: chop the rest into "matchsticks". Slice and roughly chop the tomatoes: seed and chop the peppers and chili. Quickly stirfry all these vegetables for about two minutes or until partially cooked: add the onions and garlic again, then the balti sauce. Cook for about 5-10 more minutes until you like the consistency. If you like, add white wine or vegetable stock and cook a little longer until sauce reduces thick again. Serve in karahi with naan bread, or (if you're feeling pedestrian) on a plate, with rice.