Step 2
Meanwhile, make the aioli: Combine egg yolks, mustard, garlic and lemon zest and juice in a blender or food processor and purée until smooth. With machine running, slowly drizzle in the grapeseed oil a few drops at a time until the mixture begins to thicken. Gradually increase the oil to a thin, steady stream, blending to a uniform creamy consistency. If aioli breaks, drizzle in a little lukewarm water a few drops at a time until consistency is reached again. Season with salt and pepper to taste. Will keep 2 days or more in an airtight container in the refrigerator.