Have you ever wondered why the traditional way of presenting hams is a diamond pattern?

Have you ever wondered why the traditional way of presenting hams is a diamond pattern?
With orange glaze.
With orange topping.
Ah, the flambé.
With mushrooms and green pepper.
On a postcard trimmed to fit into the recipe box.
Made with seven slices of buttered bread.
With custard sauce, for the pudding.
Guess when this recipe appeared?
With bananas (or any other fruit).
A bake-off winner from 1950.
Presumably, just substitute the word “orange” for every mention of “lemon” to produce the orange version.