The advantage of home-made food is that you have control over the ingredients.
Store bought mustard and mayonnaise contain such surprising ingredients like e.g. sugar or copious amounts of salt.
Store bought mustard and mayonnaise contain such surprising ingredients like e.g. sugar or copious amounts of salt.
You will probably also not be able to make at home anything all that similar to the mayonnaise you buy in a shop, though what you can make at home will almost certainly be equally as nice (my children were confused by the yellowish colour of home-made mayonnaise, which is sort of backwards since the confusing thing ought to be why shop-bought mayonnaise is white!).
Also a little bit of sugar in mayonnaise is fine - in the US it usually relatively trace amounts to the most commonly sold ones in the Commonwealth.