Heat 1. 0 tbsp. (15ml) olive oil in a skillet over medium heat, add the 0. 5 cups (75g / 2.65 oz) diced yellow onion, and cook for 5 minutes until softened.
Strain the 8. 0 oz (225g) canned tuna completely, flake it into the skillet, and stir in the 0. 25 cups (55g / 1.94 oz) mayonnaise and 2 large eggs (100g / 3.5 oz).
Season the mixture well to your liking, sprinkle the 2. 0 oz (55g) shredded mozzarella cheese over the top, and cook for 2 minutes or until the cheese melts completely.
Remove from heat, top with the sliced green onion, and serve your warm meal immediately.
Drain the Tuna Thoroughly: To prevent a soggy or watery dish, press as much liquid out of your canned tuna as possible before flaking it into the skillet. A dry base ensures the mayonnaise and eggs bind everything together perfectly.
Grate Your Own Cheese: Pre-shredded cheese is often coated in anti-caking agents (like potato starch) that prevent it from melting smoothly. For that perfect, gooey cheese pull, buy a block of mozzarella and grate it yourself.