This is a super-easy, delicious meal for entertaining. The key is using the tail of a beef fillet, which is thinner (and much cheaper), so it will cook very quickly. This recipe will also work well with sirloin steak.
Take the beef out of the fridge and bring it to room temperature. Season with sea salt and pepper.
To make the sauce, gently heat the mirin and sake in a small saucepan. Remove from the heat and add the soy sauce, vinegar, orange juice and crushed garlic.
Heat a frying pan over medium–high heat. Sear the beef for about 1–2 minutes on all sides. Remove from the heat and leave the beef to rest for at least 10 minutes.
Drain the onion and combine with the watercress on a serving plate. Cut the beef into
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