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PREPARE THE ROASTED TOMATOES:.
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Position the rack in the center of the oven and preheat the oven to 500F
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Place the tomatoes on a baking sheet.
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Arrange the garlic slices on top of the tomatoes and scatter the thyme sprigs over the tomatoes.
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Drizzle with the oil and sprinkle with salt and pepper.
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Roast until the tomatoes are tender and golden brown on the bottom, about 20 minutes; set aside.
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PREPARE THE BURGERS:.
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Heat 1 tablespoon of oil in a heavy large saute pan over medium heat.
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Working in batches, lay the prosciutto slices in the pan and cook over medium heat until crisp and golden, about 2 minutes per side.
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Transfer the crisped prosciutto to a paper towel-lined plate.
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Heat the remaining 1 tablespoon of oil in a heavy small saute pan over medium heat.
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Add the shallots.
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Sprinkle with salt and pepper and saute until tender, about 2 minutes.
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Stir in the minced garlic.
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Remove from the heat and cool completely.
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Gently mix the cooled sauteed shallots and garlic with the ground beef, parsley, mustard, Worcestershire sauce, crushed red pepper flakes (if using) 1/2 teaspoon of salt, and 1/4 teaspoon of pepper in a large bowl until well blended.
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Mix in the egg.
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Divide the beef mixture into 4 equal mounds.
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Using a 4-inch ring mold, shape each mound into a patty (optional) can shape them by hand.
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Preheat a grill pan or prepare a barbecue for medium-high heat.
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Brush the cut sides of the ciabatta with butter.
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Grill the ciabatta, cut side down, until lightly toasted, about 2 minutes.
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Place the ciabatta on a plate and cover to keep warm.
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Grill the patties until brown on the bottom, about 3 minutes.
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Turn the patties over.
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Top the patties with the roasted tomatoes and then with the cheese.
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Continue to grill until the patties are cooked to medium-rare doneness, about 3 minutes longer.
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MAKE THE GOURMET KETCHUP:.
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Whisk the ketchup, mustard, vinegar, Worcestershire sauce, chives, red pepper flakes (optional) & tarragon in a large bowl to blend.
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Gradually whisk in the oil to blend wel &.set the sauce aside.
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TO SERVE:.
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Place the lettuce over the grilled ciabatta bottoms.
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Set the patties on the lettuce.
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Spoon some gourmet ketchup over the burgers.
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Top with the crisped prosciutto.
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Cover with the ciabatta tops.
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Serve the remaining gourmet ketchup alongside.
