2) Divide the mixture into six (2.5cm) thick burgers. Place the slices of prosciutto on a cutting board or piece of greaseproof paper. Place one lamb burger in the centre of each slice of prosciutto and wrap the prosciutto around the burger.
3) Place a large, heavy frying pan over a medium heat. Add the olive oil and heat for two minutes. Place the lamb burgers, prosciutto covered side down, in the pan and cook over medium heat until the prosciutto is golden, about 6 to 8 minutes. Turn the burgers and finish cooking, about 6 to 8 minutes more.
4) Remove the burgers from the pan and place on a serving platter or individual plates. Top each burger with 2 to 3 basil leaves, 1 to 2 slices of tomato, and a drizzle of extra-virgin olive oil and balsamic vinegar. Serve immediately.