Heat oil in a pan, add chopped capsicum. Add cabbage, onion, vinegar, salt, pepper, stir fry for 2 minutes. Take off fire, pour over cold potato slices, toss gently with fingers. Take casserole dish, line with a layer of one third of rice. Press gently, cover with a layer of vegetable with gravy. Cover with half of remaining rice. Spread remaining gravy vegetable. Cover with remaining rice. Toss cheese into potato mixture. Spread potato mixture over rice to cover fully. Bake in preheated oven at 300oC for 12-15 minutes. Just before serving, take out. Garnish with tomato slices, salad leaves. Serve piping hot, as a wholesome meal by itself.