Break and separate eggs. We will only need the yolks. (We can use the whites in some sugar free desserts like the Floating Islands) Pour the olive oil in a measuring jug. Get it ready. Add the mustard to the egg yolks. We can use an empty jar for this or our favorite mixing bowl. The advantage of the jar is that we don't mess around that much with bowls and a lid can be put on it when it's done. However the jar requires a bit of practice as it tends to move around while the mayo hardens. Whisk yolks in a mixing bowl. Pour oil very slowly into the bowl of whisked yolks. Pour only a few drops at a time whilst whisking constantly. With a bit of luck it will thicken eventually. When it is thickened we can put the oil a bit faster but still in a slow and steady stream. Whisk until oil has incorporated completely. When half of the oil is poured in it should be nice and thick. If it isn't thick by now then the mayo has failed. Get a clean set of tools and try again.u00a0 The failed creation can be incorporated into the successful attempts later. Now we can add the lemon juice and salt. Optionally if we are looking for a shop like mayonnaise flavor pour in some sweetener too. Keep whisking and adding the second half of the oil until the end. In case we have any failed attempts that didn't thicken or broke up then this is the time to use it.