Beef tataki salad

Ingredients

• 2 tablespoon vegetable oil
• 500 gram piece thick beef steak, fat removed
• salt and freshly ground black pepper
• 2 tablespoon soy sauce
• 2 tablespoon mirin (sweet japanese rice wine)
• 2 spring onions, finely sliced
• 1 tablespoon fresh ginger, finely grated
• 2 clove garlic, crushed
• 150 gram mesclun
• 2 tablespoon toasted sesame seeds
• 2 lemons, cut into wedges