Horseradish Mayonnaise
["2 egg yolks", "1 Tbsp. Dijon mustard", "1/2 tsp. salt", "dash of cayenne pepper", "3/4 c. vegetable oil", "3/4 c. olive oil", "1/4 c. tarragon vinegar", "1 Tbsp. horseradish"]
["Combine egg yolks and seasonings.", "Add very small amount of oil and vinegar alternately, beating vigorously until mixture thickens.", "Chill.", "Makes 1 3/4 cups."]
["egg yolks", "mustard", "salt", "cayenne pepper", "vegetable oil", "olive oil", "tarragon vinegar", "horseradish"]