To make the cashew cream, grind the cashews in a mini food processor or nut grinder (some blenders are not powerful enough to turn nuts into cream, so this gives them a helping hand.) If you have a Vita-mix, skip this step. Add the water to the blender along with the ground cashews, lemon juice, 1/4 teaspoon salt and nutmeg. Blend until very smooth, about 3 minutes.