The longest part of making homemade raspberry lemonade is pureeing the raspberries. We use a blender and add the raspberries and water and blend until the raspberries are at the right consistency. After finishing with the raspberries and you want a pulp free lemonade, use a fine mesh strainer to remove any seeds. This allows you to get that smooth texture, almost like syrup. You may even have to use a spatula to really force any seeds to be removed from the puree mixture.