Step 1

Combine mirin, sesame oil, 2 tablespoons soy and 1 tablespoon sunflower oil in a bowl. Brush over steak and asparagus, then set aside while you make the sauce.

Step 2

Heat remaining sunflower oil in a frypan over medium-high heat. Add mushrooms and soften for 1-2 minutes. Stir in sugar, stock, miso, cream and remaining soy, bring to the boil, then cook over low heat for 1-2 minutes until sauce is thickened slightly. Keep warm.

Step 3

Heat a chargrill pan over high heat. Cook steaks for 2-3 minutes on each side for medium-rare, or until done to your liking. Place on a plate and leave to rest, covered loosely with foil. Cook asparagus, turning, for 1-2 minutes, until just tender and lightly charred.

Step 4

Slice steak on an angle and place on plates with asparagus. Top steak with sauce and garnish with chives.