Beef with sweet potato in a fragrant broth

Ingredients:

• 0.7 kg boneless sirloin steak (approximately 4 cm thick)
• 1 bunch of radishes (with greens)
• 5 tablespoons teriyaki sauce
• 3 tablespoons oyster sauce
• 3 tsp grated peeled ginger
• Vegetable oil, for frying
• 2 tablespoons unsalted rice vinegar
• 1 tbsp. l. brown sugar
• 2 small sweet potatoes, peeled and cut into 0.5cm thick rounds.
• 1 bunch green onions, separate white parts from green parts and cut into 4cm pieces.
• Dark sesame oil, to drizzle

Preparation:

1. Coarsely chop the radish greens. Cut the radishes into 8 pieces.
2. Heat a grill pan over medium-high heat. Combine 2 tablespoons teriyaki sauce, 2 tablespoons oyster sauce, 1 teaspoon ginger, and 1/2 teaspoon pepper in a bowl, then coat the steak.
3. Lightly oil a grill pan, then sear the steak for about 5 minutes per side for medium-rare. Transfer to a cutting board and let rest for 5 minutes, then slice thinly.
4. Meanwhile, in a saucepan, bring the remaining 3 tablespoons teriyaki sauce, 1 tablespoon oyster sauce, 2 teaspoons ginger, vinegar, brown sugar, and 2.5 cups water to a boil and cook, stirring, until the sugar dissolves. Add the sweet potato, radish, and white onion and cook, covered, stirring occasionally, until the vegetables are tender, about 10 minutes.
5. Add the radish and onion greens and cook until slightly softened, about 5 minutes. Divide the vegetables, broth, and steak among plates. Drizzle with dark sesame oil.