Zebra Ogura cake recipe (with video) - Rice 'n Flour

Ingredients

• 4 gram (2 tsp) bamboo charcoal powder
• 15 ml (1 tbsp) hot water
• 5 egg yolks (medium-sized, 18 – 20 gram/yolk)
• 1 egg (medium-sized, 50 gram excluding shell)
• 60 gram (4.5 tbsp) cooking oil
• 80 ml (1/3 cup) milk
• 75 gram (1/2 cup + 4 tsp) all-purpose flour
• Few drops of yellow food coloring (optional)
• 5 egg whites (medium-sized, 30 – 33 gram/white)
• Dash of salt
• ¼ tsp cream of tartar (optional)
• 75 gram (1/3 cup) caster sugar