Preheat oven to 350 F and line a square pan with parchment paper, brush lightly with vegetable oil. Preheat the pan for 5 minutes

Mash potatoes, set to side. Mix flour, starch and salt, set aside

Warm coconut milk with sugar, either on stovetop or microwave, stir until sugar dissolved, and let it cool to room temperature slightly

Beat eggs, lightly, then stir in essence, and melted butter, stir mixture into coconut milk followed with mashed potatoes and flour mixture, strain

Pour batter into preheated pan and sprinkle top with sesame seeds

Bake cake for 45-55 minutes and cool completely before slicing