In a glass or metal bowl add the egg yolks, water, vinegar and salt and whisk until fluffy for a minute or two!
Next heat a pan with water, this is to place the metal bowl on top it must not touch the water.
In another pan melt the butter so its liquid. Keep it warm.
Place the metal bowl over the simmering water. And whisk the egg yolks until they start to thicken, if it goes a little lumpy quickly take off the heat and add a tablespoon of cold water, quickly whisk away the lumps.
Take off from the heat and slowly add the melted butter whisking all the time! Do not pour in the whites leave them at the bottom of the pan.
Squeeze in some lemon, taste and its done !
