Directions
Burgers:
In a large bowl combine the ground beef, bread crumbs, basil, egg, milk, sun-dried tomatoes, salt, and pepper. Stir to combine. Divide the mixture into 6 (1-inch) thick burgers. Wrap the prosciutto around the burgers.
Place a large skillet over medium heat. Add the olive oil and heat for 2 minutes. Place the burgers in the pan and cook over medium heat for 6 to 8 minutes per side.
Dressing:
Combine the mustard and vinegar in a bowl and whisk as you slowly pour the olive oil into it. Will thicken a bit.
Serve with or without buns topped with tomato slices and a drizzle of the dressing over the burgers.