Japanese Style Steak Tartare

Ingredients

• 50 g white beech mushroom
• ¼ ciabatta
• 2 tbsp neutral oil
• approx. 170 g round steak (at room temperature)
• 1 spring onion
• 2 tbsp Japanese soy sauce less salt
• 1 tsp (toasted) sesame oil
• ½ tsp Worcestershire sauce
• ½ tsp wasabi
• 2 egg yolks