*If using a high-speed blender, such as a Vitamix, the nuts do not need to be soaked. If using a weaker blender, soak the nuts in water for at least 2 hours. Drain and rinse before using.
**For a stronger lemon flavor, try adding ½ teaspoon
lemon oil, it's in the baking aisle near the vanilla extract.
Note: this icing is very messy, these are best eaten just after they’re iced. To make ahead and/or transport them, freeze the iced cookies (place them on a plate in the freezer until icing is set, then transfer to freezer baggies) and let thaw at room temp for 20 minutes. The un-iced cookies also freeze well.