Start by making the mayonnaise. Add the egg yolks, apple cider and mustard (if adding it in) to your thermomix bowl or food processor. Start by very slowly drizzling the oil in while the ingredients in the bowl are churning on a low speed. Keep drizzling the oil in slowly until a beautiful thick mayonnaise has formed. If it goes too thick, start drizzling in some of the water until you reach your desired consistency.
Now add the shredded veggies, herbs, red onion and lemon juice into a large bowl and mix to combine.
Mix through some of the mayonnaise to taste.
Serve and enjoy.