Cook the potatoes

• Boil the potatoes in salted water until tender.
• Drain and mash with the warm milk and half of the butter.
• Season with salt and pepper and keep warm.

Sear the lion's mane steaks

• Heat the olive oil in a frying pan over high heat.
• Sear the lion's mane steaks until golden on both sides.
• Add the remaining butter and thyme, baste the steaks and season with salt and pepper.

Make the mushroom sauce

• In another pan, soften the onion and garlic in a little butter.
• Add the sliced mushrooms and cook until browned.
• Pour in the soy sauce and vegetable stock and simmer until slightly reduced.

Serve

• Spoon the mash onto plates.
• Top with the lion's mane steak and pour over the mushroom sauce.