Make the sauce. Combine the Worchestershire-style sauce, ketchup, and the sugar in a heatproof container, and microwave for 15 seconds at 500 W. Mix well.
Lightly pepper one side of the sashimi.
Put the tuna and mayonnaise in a plastic bag. Massage over the bag to mix thoroughly.
Add panko and shake the bag so that the panko will coat the tuna evenly.
Heat the frying pan and spread the mayonnaise for pan-frying. When the mayonnaise begins to melt, align the panko-coated tuna without overlapping.
Cook on both sides over medium heat. Take care not to burn. When golden brown, transfer onto a serving dish.
Dish it up, and it's done. Scatter on some parsley to make it colorful. Sprinkle a little lemon juice to give it a refreshing flavor.
Story Behind this Recipe
I wanted to use the leftover sashimi tuna and turn it into something completely different. So, I came up with this quick and easy dish using mayonnaise with which I often make stir-fried dishes.
You don't need any seasoning ingredients if you use mayonnaise. The egg contained within the mayonnaise improves the richness of the dish and it also simplifies things a bit! I used sliced tuna since it was inexpensive, but you can use any other cuts of tuna as well.