Buy OSRS Tuna potato
The tuna potato is a food item in Old School RuneScape. It heals 22 Hitpoints when you eat it. This makes it one of the best single-bite foods in the game. Only the marlin heals more in one bite. It heals the same amount as dark crabs, anglerfish, and manta rays, but it has the lowest Cooking level needed of that group.
This food is great for hard fights. Bosses, slayer tasks, and player versus player combat all go better with strong healing. The tuna potato is a baked potato topped with tuna and sweetcorn.
Making one yourself takes level 68 Cooking and many steps. You need to bake a potato, churn butter, cook tuna, and cook sweetcorn. Then you chop the tuna in a bowl, mix in the corn, and add it all to the buttered potato. Buying tuna potatoes skips all that work and saves time.
The tuna potato is a members only item. It is tradeable and noteable, so it is easy to carry in bulk as notes. Each one weighs 0.5 kg. Stock up before your next trip and stay in the fight longer.