It is used in castella , manju , and monaka ; as a topping for kakigori ; mixed with milk and sugar as a drink ; and mixed with salt and used to flavor tempura in a mixture known as matcha-jio . It is used in castella , manjÅ `` , and monaka ; as a topping for kakigori ; mixed with milk and sugar as a drink ; and mixed with salt and used to flavor tempura in a mixture known as matcha-jio .