In a high speed blender or NutriBullet, combine the sunflower seeds, lemon juice, water, salt & garlic powder. Blend until smooth, scraping down sides as needed. Add a tablespoon of water at a time to help thin, if needed. Careful not to add too much water. Taste test and more salt, garlic powder, or lemon juice, as desired. Scoop out into a bowl and set aside.