Add the pomegranate seeds and the lemon to a bottle and then sprinkle the crystal rock sugar over the top. Finally pour in the white rum. This time I used an empty bottle that used to be filled with dark rum so I didn't have to sterilize it. However, make sure you usually sterilize the container that you're going to steep everything in, either with alcohol or boiling water. Remove the fruit after 2-3 months.