Preheat the oven to 400 degrees

In a large bowl, stir together the meat, breadcrumbs, vegetable puree, milk, soy sauce, garlic and pepper with a wooden spoon, the mixture will be moist. Form into 8 small patties and place them on a sheet of waxed paper or aluminum foil.

Coat a large nonstick skillet with cooking spray and set it over medium-high heat. When the skillet is hot, add the oil. Add the burgers and cook until nicely browned on one side, 4 to 5 minutes. Turn the burgers, then slide the skillet into the oven and bake for 4 to 5 minutes longer, until the burgers are no longer pink in the middle. Serve each burger on a split roll.