Barbecued Salmon Burger

Ingredients

• 100 ml beetroot juice (or ¼–½ teaspoon turmeric in same amount of water)
• 1/2 cube fresh yeast
• 1 egg, separated
• 250 g flour, plus extra for flouring
• 1 tbsp sugar
• Salt
• 40 g softened butter
• A few leaves of thyme
• 600 g salmon fillet, skin removed
• 1/4 tsp lemon pepper or black pepper
• 3 1/2 tbsp Kikkoman Naturally Brewed Soy Sauce
• 1 beef tomato
• 1 small courgette
• 2 dried figs
• 3 tbsp mustard
• 1 tsp maple syrup
• 4 slices cheese