Smash the sweet potato, salt, sugar, milk and butter. Use the spatula fold to combine well. Add yolk and almond flour, fold to combine well. Then use the plastic wrap cover and flatten 1 cm thick. Cut into a square, brush with yolk and sprinkle the white and black sesame. Bake at 180 degrees celsius for 20 minutes or until turn to golden brown. Ready to enjoy 🥰