In a pinch, tomato purée does the trick too. Usually served warm, this sauce is best made not too far in advance, as the raw eggs might go off. It makes for a good substitute for hollandaise as it can ...

Hollandaise sauce has a reputation for being fussy ... with butter and lemon juice to make a Hollandaise that is very hard to ruin. The technique can be used with your favorite Hollandaise recipe — ...

You can always skip the reduction of the vinegar and just use 1 tablespoon of good quality white wine vinegar. If the hollandaise gets too cold and splits, heat the butter before adding more.

Poach the remaining duck eggs in the same way. Set aside the pan used to poach the eggs and the poaching water. For the hollandaise sauce, melt the butter in a saucepan, then remove from the heat ...