Tuna Appetizers
["8 slices white bread", "1 (6 1/2 oz.) can tuna", "1/2 tsp. grated onion", "1/2 tsp. Worcestershire sauce", "1/4 tsp. salt", "few grains cayenne", "1/4 c. mayonnaise", "1 egg white, stiffly beaten", "1/2 c. coarsely grated Swiss cheese", "paprika"]
["Cut bread into 24 (1 1/2-inch) rounds and toast on one side only.", "Set aside."]
["white bread", "tuna", "onion", "Worcestershire sauce", "salt", "cayenne", "mayonnaise", "egg", "Swiss cheese", "paprika"]