Ingredients

Makes 16 hors d'oeuvres

　　1 large Vidalia or other sweet onion (1 to 1 1/4 pounds, at least 4 inches in diameter)

　　8 very thin (1/4-inch) slices firm white bread, crusts discarded

　　1/3 cup mayonnaise

　　1/2 cup finely chopped fresh parsley

　　

Step 1

Cut 4 (1/8-inch-thick) slices from widest part of onion, keeping rings intact.

　　

Step 2

Spread each slice of bread with about 1 teaspoon mayonnaise and top 4 slices with 1 onion slice each. Top with remaining bread slices, mayonnaise sides down, then trim onion flush with bread. Quarter sandwiches into small square or triangular sandwiches.

　　

Step 3

Arrange 2 sheets of wax paper on a work surface. Spread remaining 2 1/2 tablespoons mayonnaise in a thin layer on 1 sheet and spread parsley evenly on the other.

　　

Step 4

Dip all edges of 1 sandwich in mayonnaise to coat, then dip in parsley. Transfer to a tray and repeat with remaining sandwiches.