Tuna Sandwich

Add all the ingredients for the egg mixture to a bowl and mix well.

Slice the onions thinly, pour a lot of salt (not included) and use soaking to thoroughly wash away the spiciness. Add tuna and mayonnaise to it and add it in a bowl.

Heat 2 tablespoons of olive oil in a frying pan and pour the egg mixture from [1]. Sway the frying pan over high heat, cook it, then cover it with a lid and turn it over, cook for about 30 seconds, then turn it off and put it on a cutting board.

Remove the round corners of the egg with a knife and divide them into quarters.

Mix the kneaded rice with butter to make mustard butter, spread a lot on the bread, and place one slice of salad vegetable on top. Top with plenty of [2] and cover with omelette, salad vegetables, and finally bread.

After applying a little pressure with your hands to calm it down, cut off the four sides with a knife. Cut it into three parts.

Row it to the side and place it on a plate. Serve with salad vegetables (not included) for finishing.