Cut the meat into bite-sized pieces. Put the rice and the ● ingredients into a bowl and mix.
Put plastic wrap in a cup or small container, divide the rice into fourths, and put each one into the container to make 4 rice buns. (The rice is less likely to crumble if you make the buns this way rather than just shaping them with your hands.)
Heat the butter and oil in a frying pan. (Add oil so the butter doesn't burn). Cook the rice buns from Step 2 over medium heat, making sure to cook both sides until they are browned.
Put the rice buns on a plate and cook the meat in the same frying pan. Season with salt and pepper.
Put lettuce and the meat from Step 4 on the rice buns and it's done!
(I didn't have any lettuce, so the photos shows the burger with only meat.)
Story Behind this Recipe
I love the rice burger made by a certain famous burger chain.
If you don't have yakiniku sauce, it also tastes great with a combination of sugar and soy sauce (2 teaspoons : 3 teaspoons). You can use anything you like for the filling such as kimpira burdock.