Grilled Tuna Burgers

55g dry breadcrumbs

4 tablespons finely chopped spring onions

4 tablespoons grated carrot

1 tablespoon finely chopped fresh root ginger

1 tablespoon chopped fresh coriander

1 teaspoon sesame oil

1 tablespoon tomato ketchup

1 tablespoon light soy sauce

1/2 teaspoon ground cumin

1/4 teaspoon salt

1/4 teaspoon black pepper

1 egg, beaten

6 burger buns

6 lettuce leaves, rinsed and dried

2 medium tomatoes, sliced