Lightly spray a large frying pan with oil and place over medium heat. Add mince and cook for 4 minutes, stirring regularly, or until lightly browned. Add carrot and ginger, cooking for a further 3 minutes or until carrot has softened. Season with pepper. Remove pan from heat and set aside to cool.
Place lettuce leaves in pairs on a benchtop, overlapping the leaves slightly. Spoon mince evenly among lettuce, running in the same direction as the stalk. Carefully roll each set of leaves to enclose filling.
Place in lunch boxes with corn, cheese and rockmelon.
Choose the crispiest lettuce leaves and you can make a whole variety of rolls with different fillings. Tuna, ham and chicken. Ask the school to refrigerate lunchboxes to prevent tummy upsets.
In winter, if you substitute cabbage leave, make the rolls and put them in a casserole with some vegetable or chicken stock, you have a great one-pot hot meal. Rice, vermicelli or any softnoodles will do fine.