Fish Cakes Yummy, tuna "patties" By Guest Contributor August 14, 2011 Fish Preparation Time Cook Time Servings0IngredientsTin TunaInstant Mash Potato1 EggBread CrumbsSeasoningInstructions Step 1: Drain tuna an put aside juices for liquid for instant mash. Step 2: Combine tuna, ‘potato’?, egg an seasonings Step 3: Coat in breadcrumbs an fry on a medium heat until brown.