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~NOTE~ I use Recipe #82337 for the buns which can be made up a day ahead of time or several weeks ahead of time if frozen. The recipe makes 2 loafs, but I divide the dough to make 8 buns. If you don't have time to make the focaccia buns, then regular buns can be used.
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In a large mixing bowl, combine bread and milk and allow to sit for several minutes.
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Squeeze the milk from the bread and discard milk.
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In the same mixing bowl, combine the wet bread, ground beef, garlic, parmesan cheese, oregano, parsley, red pepper flakes, pepper, and salt.
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Mix ingredients by hand to combine well.
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Divide meat mixture into 4 and form 4 patties about 3/4-inch to 1-inch thick.
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In a large skillet, heat 2 tablespoons olive oil with butter.
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Once butter is melted, add sliced red onions and saute until tender, but not brown.
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Remove onions from skillet and place on a plate.
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Place patties in hot skillet.
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Cook patties 5-6 minutes on each side, or until done to your liking.
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While patties are cooking, you can toast the buns, if desired.
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Just before patties are done, place 1 slice of provolone cheese and 1 slice on mozzarella on top of each patty and allow to melt.
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Remove patties from skillet and place them on paper towels to drain.
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Place each patty on a rosemary focaccia bun.
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Top each patty with a slices of roasted red bell pepper and a few grilled onions.
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Serve open face and allow your guest to dress up their burgers with the condiment of their choice - such as lettuce, tomatoes, mayo and mustard.