Beef Bowl Gyudon - 牛 丼, Morgane's recipe

Ingredients

• 600g beef (rib steak, tenderloin)
• 500g short grain rice
• 2 cups water
• 3g kombu seaweed
• 1 cup water
• 2 onions
• 1 tbsp grated ginger
• ½ tbsp bonito dashi powder
• 1 pinch salt
• 1 tbsp sugar
• 3 tbsp mirin
• 3 tbsp Kikkoman soy sauce
• 4 eggs
• ¼ cup white vinegar
• 1 spring onion
• Gari ginger
• Shichimi powder