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1
Cut 8 slices of bread with a serrated knife ( each slice should be about 1/4 inch thick) and set aside.
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2
Reserve remaining bread for another use ( or for more sandwiches tomorrow )
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3
Melt 4 tablespoons (1/2 of the stick) of the unsalted butter in a heavy saucepan over medium-high heat
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4
Add the brown sugar and stir into the butter until incorporated
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5
Add the sliced onions to the pan and saute until the onions become caramelized and golden brown in color, approximately 20-25 minutes.
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6
Stir in chopped rosemary and remove from heat.
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7
Spread remaining softened butter on one side of each slice of bread
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8
Heat a grill pan (or flat griddle pan) over medium high heat
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9
Place bread slices butter side down on a platter.
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10
Layer 3-4 slices of proscuitto on top of 4 of the 8 bread slices, top generously with caramelized onion mixture.
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11
Place one slice of Provolone cheese on top of the onion mixture.
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12
Top with another slice of bread, butter side up.
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13
Do this with all 4 sandwiches.
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14
Place sandwiches on the grill pan 2 at a time (due to the large size of the sandwiches).
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15
Cook on first side until the underside is golden in color, approx.
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16
5 minutes.
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17
Turn and cook on the remaining side until it is also golden and the cheese is melted.
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18
Serve warm.
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19
I suggest serving a nice Italian red wine with this, it turns it into a quick and easy comfort meal.
