In a high speed and high powered blender (such as a Vitamix or Ninja), or with a food processor (this is my go-to), process your almonds and then gradually add the grapeseed oil.
Second, once the consistency is creamy, add all your other ingredients (except your lemon juice!)
Next, once your bitchin mixture (see what I did there?) is blended, taste! This is where you decide exactly how much lemon juice to add. Add as much as you feel cuts through the oil in this recipe. That might be the entire half-cup or a fourth of a cup. Depends on your desired taste.
Finally, taste again and add ground pepper and more salt if desired.