Add the egg yolks, lemon juice 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.
Taste the mixture and adjust the flavour if needed, add more salt, lemon juice or mustard if desired.
Store in a small glass jar in the fridge.
Serving Size roughly 1 cup
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