Instructions: Preheat the oven to 350 F. Quarter onion lengthwise, then cut into thin slivers crosswise. Mix the onion with 5 tablespoons of the mayonnaise and salt and pepper to taste. Set aside. Spread 3 slices of bread on one side with the remaining mayonnaise. Cut these into quarters. Cut the remaining 3 slices of bread into quarters and spread each square evenly with the onion mixture. Top with the reserved bread squares, mayonnaise side up. Place these on a baking sheet and sprinkle the tops generously with Parmesan cheese. Bake until lightly golden and slightly puffy, about 15 minutes. Serve immediately.

Makes 12 bites

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