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Cut slits 1/3 of the way into the steak 1/4-inch apart. Flip the steak over and repeat, holding the knife at the same angle.
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Mix the onions and salt and surround the steak in onions. Cover and marinate in the fridge overnight.
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When the steak is done marinating, brush off all of the onions from the meat and set the onions aside. Season both sides of the steak with black pepper.
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Preheat a frying pan over medium-high heat until very hot. Add the vegetable oil, and then add the steak.
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Fry on one side until nicely browned, and then flip and fry the other side.
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When the steak is cooked to your liking, transfer it to a plate and let it rest while you prepare the onions.
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Turn down the heat and add the onions. Stir-fry these until they've started to brown around the edges, but they still hold their shape (about 6 minutes).
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Add the soy sauce and continue stir-frying until the liquid has evaporated and the soy sauce starts to smell toasty.
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Add the red wine and boil until it no longer smells like alcohol.
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To finish the sauce, add the butter and vigorously whisk it in to thicken the sauce.
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For the rice, fold the minced umeboshi into the hot rice until evenly distributed.
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Fill two bowls with the ume rice, and then top with the sliced steak. Finish each bowl with a mound of onions, and garnish with some chopped scallions.