How to Make It
Sauté onion in butter in a heavy saucepan until tender. Strain butter and onion mixture through a sieve into beaten egg yolks. Add whipping cream; stir well. Cook yolk mixture in top of a double boiler over medium heat, stirring constantly, until thickened. Stir in horseradish; serve hot or cold.
Oxmoor House Homestyle Recipes