PRAIRIE OYSTER

1 teaspoon Worcestershire sauce
2 dashes vinegar
Dash pepper
1 teaspoon tomato catsup
1 egg yolk

1. Fill cocktail shaker with ice.
2. Add Worcestershire sauce, vinegar, pepper, and tomato catsup.
3. Shake.
4. Strain into an previous-formed glass.
5. Drop in egg yolk without breaking yolk.