CLEAR LEMON FILLING Recipe

I use this filling recipe for a coconut cake. Whisk together the first 3 ingredients in a medium saucepan. Whisk in water until blended. Bring to a boil over medium heat. Cook, whisking constantly for 2 minutes. Remove from heat. Add butter, lemon rind and lemon juice. Cook over medium heat, whisking constantly for 1 to 2 minutes until slightly thickened. Remove from heat. Stir in coconut. Place saucepan in a large bowl of ice water for about 5 minutes, whisking often, until it is completely cool.