This recipe is best when prepared with a high-speed blender, but I do have a couple alternatives. First, you can use a food processor if you have access to one. Just note that it may hold a different capacity to that of a blender so you might have to make the sauce in batches. Alternatively, you can try using cashew butter and mixing together with the other ingredients using a whisk or spoon. I have not personally tried this method so you’ll have to test out the proper measurements to get the right consistency. The texture might be a little more gritty with a stronger nut flavor, but still yummy!