Rub trout inside and outside with quarter cut lemon. Season trout inside and out with salt and pepper. Place onion in bottom of casserole and put trout on top of onion. Spread orange sections around trout. Squeeze orange juice and lemon juice on trout. Pour wine in casserole. Cover casserole in aluminum foil and bake at 230ºC for 25 to 30 minutes. ----