Remove turkey roll from refrigerator 30 minutes before cooking. Preheat oven to 200°c. Calculate cooking time, allowing 30 minutes per kg (and remember you need at least 20 minutes' resting time).Pour 1/2 cup water into baking dish and put into oven to cook.emove turkey roll from refrigerator 30 minutes before cooking. Preheat oven to 200°c. Calculate cooking time, allowing 30 minutes per kg (and remember you need at least 20 minutes' resting time).