Place a saucepan with some water and a glass bowl in it on the heat.
The bottom of the glass bowl should just touch the water.
Let this simmer very gently the whole time.
Beat the yolks with the water, vinegar, and lemon juice, season with pepper and salt.
Now whisk vigorously over the lightly boiling water until you have a firm foam and no liquid eggs are visible at the bottom.
Add the butter spoon by spoon while whisking.
Taste and season if necessary.
You can keep the mousseline warm over the water.
As it cools, it will thicken due to the butter.
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