Remoulade Sauce

NY Times. Accompanied their recipe for crab cakes.

Ingredients

1 large egg yolk
3 tablespoons Dijon- or Creole-style mustard
cup white-wine vinegar
1 tablespoon paprika
1 cup vegetable oil
2 tablespoons grated horseradish, fresh or prepared
1 teaspoon finely chopped garlic
1/3 cup finely chopped scallions
1/3 cup finely chopped celery
2 tablespoons finely chopped parsley
2 tablespoons ketchup
Salt and freshly ground black pepper to taste

Instructions

Put the egg yolk, mustard, vinegar and paprika in a mixing bowl. Blend with a wire whisk and add the oil gradually. Beat briskly, then add the remaining ingredients and blend well.