Yield
Makes 2 servings
James Carrier

How to Make It

Step 1

In a 1- to 2-quart pan over high heat, bring 1 cup water and the sugar to a boil. Add vinegar and onions, and stir occasionally until boiling again. Remove from heat and let cool, about 30 minutes.

Step 2

Meanwhile, spread mayonnaise on toast and set each slice, mayonnaise side up, on a plate. Arrange half the prosciutto, then half the avocado, on each slice of toast.

Step 3

Drain onions well and mound half on each open-faced sandwich. Sprinkle with salt and pepper. Eat with a knife and fork.

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