Adjust oven rack to middle position and preheat oven to 180°C. Cut the kernels off the cob and spread them in a buttered ovenproof dish ± 18 cm x 14 cm. Skin and slice tomatoes and pack out in a single layer over the corn. Season with Green Onion Seasoning. Top with drained flaked tuna and half of the Cheese Sauce. Butter the bread and cut into triangles. Arrange bread over fish. Squeeze remaining Cheese Sauce over the bread triangles and sprinkle with grated cheese. Bake for 25 - 30 minutes.
Replace the corn kernels with frozen peas.