Mayonnaise

place all ingredients on the stone on the work table 20 minutes before starting to prepare the mayonnaise.
this way everyone will be at the same temperature.
pour the yolk in a bowl and add the mustard, 1 tablespoon of vinegar or lemon juice, salt and pepper.
mix and let stand 5 minutes.
then add the oil or oil, beating with a wire stick.
start by adding the oil, drop by drop, increasing the amount progressively.
add the rest of the vinegar or lemon juice and adjust the seasonings.

respecting the 5-minute rest before adding the fat, it is not natural for the mayonnaise to cut.
if this happens, pour a tablespoon of boiling water into a bowl and add the carved mayonnaise in small portions, beating between each addition.
do not add the carved mayonnaise until the portion you added earlier is perfectly connected.
in order to keep the mayonnaise in the refrigerator for 2 days without slicing, pour it with 1 tablespoon of boiling water as soon as you finish preparing it and stir vigorously.