Heat the frying oil over medium heat. Place the rose cookie mould in the oil so that it heats up too.
Mix the maida, rice flour, powdered sugar, sesame seeds, salt and nutmeg. Add the coconut milk, water, egg and vanilla and mix into a smooth batter with the consistency of crepe batter.
Lift the hot mould from the oil and shake off the excess oil carefully. Dip it into the batter to coat only three-quarters of its depth, keeping the top edge clear of batter.
Lower the coated mould into the hot oil. Gently shake it to release the kokkisan into the oil.
Fry until light golden brown, turning with a chopstick or skewer so it cooks evenly.
Lift the cookie out and drain on paper towels. Reheat the mould in the oil and repeat with the remaining batter.
Allow the cookies to cool and enjoy their crunch.