A light taste that accompany fish & other dishes perfectly. A low cost recipe by Mrs Avra, a lady from the island of Chios...
In a bowl, mix the egg yolk with the mustard well and leave it aside.
In a bain-marie (no special utensil is needed, just place a metal or fireproof bowl over a pot of boiling water) we place the water, the cornflour / corn starch, the salt and pepper. Stirring them constantly with an egg beater whisk until it thickens and becomes the texture of a sauce. Also, you 'll see the consistency of the mixture has been slightly transparent.
Turn off the heat and add in the beaten egg yolk with the mustard, a small amount of the hot mixture, stirring them constantly and then pour it into the mixture and continue to stirring them for another 2 minutes.
Remove the bowl from the bain-marie and dripping the oil, one at the time while stirring constantly.
At the end, we slowly add the lemon juice and our mayonnaise is ready.