Homemade French Mustard
Three tablespoonfuls of mustard, one tablespoonful of granulated sugar, well worked together, then beat in an egg until it is smooth; add one teacupful of vinegar, a little at a time, working it all smooth; then set on the stove and cook three or four minutes, stirring all the time; when cool, add one tablespoonful of the best olive oil, taking care to get it all thoroughly worked in and smooth.