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Toss the beef in the cornflour (reserving about 2 teaspoons for thickening later) until evenly coated. This will help create a crispy exterior and thicken the sauce as it cooks.
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Heat a film of oil in a large frying pan or wok over high heat. Add the beef in batches, searing for 2-3 minutes per side, or until nicely browned. Remove and set aside.
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In the same pan, add a little more oil if needed. Stir fry the broccoli florets for 3-4 minutes, or until just tender but still bright green. Add the edamame to the pan and toss to heat.
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In a small bowl, whisk together the gluten-free soy sauce, mirin, honey, sesame oil, garlic, and ginger. Stir in the cornflour mixed with a little liquid to thicken.
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Return the cooked beef to the pan with the broccoli. Pour in the teriyaki sauce and toss everything together for 1-2 minutes, until the sauce has thickened and the beef is fully coated.
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Divide the rice between bowls, top with the beef and broccoli, and garnish with sliced spring onions and sesame seeds. Serve immediately while hot.