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Export 4 ingredients for grocery delivery
Step 1
Preheat broiler.
Step 2
Stir together onion and mayonnaise. Arrange bread slices in 1 layer on a baking sheet and broil 6 inches from heat until lightly toasted (watch carefully). Remove from oven and turn toasts over. Spread evenly with onion mixture and sprinkle with cheese and freshly ground pepper.
Step 3
Broil hors d’oeuvres until topping is bubbling and lightly browned, 1 to 2 minutes (watch carefully to prevent burning).
Step 4
Serve warm.