Combine a few cloves of garlic, one egg, a spoonful of Dijon mustard, a touch of maple syrup, lemon juice, some grated Parmesan, a handful of capers, apple cider vinegar, salt, pepper, and optionally anchovies in a blender.
Turn on the blender and slowly drizzle in the oil until the mixture thickens and reaches a smooth, creamy texture.