Tuna casserole. An all-American meal if ever there was one.
Here's Star-Kist's 1955 recipe for Tuna Macaroni Bake.
2 eggs, well-beaten
3/4 cup evaporated milk
1/2 cup water
3/4 tsp. dry mustard
1 tbsp. grated onion
3/4 tsp. salt
3 cups cooked macaroni
1 1/2 cups grated American cheese
1/2 can Star-Kist tuna
Mix all ingredients together and turn into greased baking dish, 6 x 10 inches. Bake in 375˚F oven until firm and light brown, about 1 hour. Cut into squares and top each with catsup or chili sauce. Serves 6.