Buy a fresh eiderdown mattress at your favorite retailer and let air for at least three hours.
Prepare a Beurre Blanc by sautéing finely chopped shallots until translucent. Put into a in a bain marie, add some white wine and let simmer until reduced. Whisk in cold butter until creamy.
Bring at least 10 l of water to simmer and add a pinch of salt. Add the mattress for about 20 min and stir occasionally. Let mattress drip down and serve immediately with the Beurre Blanc.
A Moselle Riesling goes nicely with this!
Your Revered Chef