牛扒丼

First, slice the onions and slowly caramelize them in a pan over medium-low heat.

Take the filet mignon pieces that have been resting at room temperature for at least 30 minutes. Season them with salt, then place them in a medium-hot pan. The cooking time will vary depending on the thickness of your filets; for reference, I cooked mine for about 7 minutes and then let them rest wrapped in foil for 10 minutes.

To prepare the sauce, combine the soy sauce, sake, mirin, sugar, and bonito flakes in a small saucepan. Stir these ingredients together and heat until the mixture is warm.

To assemble your donburi, place the cooked rice into a bowl. Layer the caramelized onions on top, followed by thinly sliced pieces of filet mignon. Drizzle the warm sauce over the meat and, as an optional touch, add a small dab of wasabi to the side.