Tartaburger

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8 ounces trimmed beef tenderloin, sliced and very finely chopped to a smooth pulp

1/2 cup chopped onion

2 teaspoons capers

2 gherkins, finely chopped

2 tablespoons brandy

2 teaspoons Worcestershire sauce

1 tablespoon finely chopped parsley

1 teaspoon strong French mustard

Salt, to taste

Black pepper, to taste

1 egg yolk

Clarified butter

1/4 cup smooth, dry red wine