Teriyaki tuna jacket potato different to the normal tuna mayo By Guest Contributor September 23, 2015 One Preparation Time Cook Time Servings1IngredientsTunaTeriyaki saucered onionjacket potatored pepperInstructions Step 1: 1. Cook the jacket potato in the oven at 220 for 1 hour Step 2: 2. Whilst the potato is cooking mix 2 tablespoons of teriyaki sauce with a drained can of tuna Step 3: 3. Dice the peppers and onions and add into the tuna Step 4: 4. Cut the potato open and fill with the tuna mix