The secret here is to use thick slices of prosciutto. When testing, we used packages of pre-sliced San Daniele prosciutto, whose uniform shape and thickness made wrapping the cheese very easy. If buying from the butcher, ask to have it sliced thicker than usual.
Store toasted baguette rounds in an airtight container at room temperature up to 3 days. Prepare prosciutto rolls. Place on a plate, cover and refrigerate overnight. Warm in microwave in batches. Place on baguette and sprinkle with onion.
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