Rinse the buckwheat groats under cold water. In a saucepan, combine the groats with water or beef broth. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes or until the buckwheat is tender and the liquid is absorbed. Fluff with a fork and set aside.
1 cup buckwheat groats, 2 cup beef broth
In a large skillet, heat the olive oil over medium-high heat. Add the red onion, sautéing for 3-4 minutes or until fragrant and slightly caramelized. Season the sliced steak with a pinch of salt and pepper, then add it to the skillet. Cook for 2-3 minutes per side, or until browned and cooked to your desired doneness. Remove the steak from the skillet and set aside.
1 tbsp olive oil, ½ medium red onion, 1 lb steak
In the same skillet, add the minced garlic and ginger. Cook for about 30 seconds, or until fragrant. Add the soy sauce, sesame oil, and rice vinegar to the skillet. Stir to combine and bring to a simmer.
2 tsp garlic, 2 tsp ginger, 2 tbsp soy sauce, 1 tsp sesame oil, 1 tbsp rice vinegar
Add the broccoli florets to the skillet and toss to coat in the sauce. Cook for 4-5 minutes, or until the broccoli is tender-crisp.
1 head broccoli
Return the cooked steak to the skillet and toss to combine with the broccoli and sauce. Cook for another 1-2 minutes to heat through.
To serve, portion ¾ cup of buckwheat to each plate. Top with the beef and broccoli mixture. Garnish with sesame seeds and sliced green onions.
green onion, sesame seeds