In a blender, combine the maple syrup, apple cider vinegar, walnuts, shallot, garlic, mustard, salt, and black pepper. Puree until smooth.
While continuing to blend, slowly pour in the walnut oil and canola oil. If the mixture is too thick, blend in a little more oil or vinegar to taste and reach desired consistency.
Pour into a bottle, cover, and refrigerate forĀ up to a week.