Runny Yolk Sauce

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SERVES4 to 6 (Makes about 1 cup)

Runny Yolk Sauce

WHY THIS RECIPE WORKS

Chefs are obsessed with emulsions because they combine something that is already delicious—unctuous fat—with a water-based ingredient to create something even more satisfying (think mayonnaise, butter, and cream—all emulsions). And egg yolk...