Combine all ingredients in a large bowl. Mix thoroughly. Shape into 4 large patties. Place patties on oiled grill. Grill over medium-high heat 4-6 minutes on each side, until a digital thermometer inserted in the centre of the burger reads a temperature of 74oC (165oF). Serve with Mozzarella cheese and red pepper slices, if desired.
Nutritional Information (per burger): Calories: 280; Protein: 22 g; Fat 15 g; Carbohydrates 13 g.