I love to watch the Food Network and I saw this sandwich on one of their programs. I did not catch the name of the restaurant, but the story behind this sandwich was interesting. It said that this sandwich was created for "fussy eater" A father used to take his daughter to lunch on Saturdays at this popular restaurant in Havana, Cuba (before Castro) and the daughter was a fussy eater so there were very few things she liked. She loved strawberry jam, so the father asked the waiter to come up with a sandwich for her and so the Elena Ruth sandwich was born. I have not tried it, but when I saw the recipe, I knew it was something that I would like, however, I am not a fussy eater! The amounts of each ingredient are really to your own taste. I have estimated for the sake of the recipe format. I believe the cuban bread would be Midnight sandwich bread or any sweet bread that you like. If you try this, I hope you enjoy it!
Addendum: I am adding an explanation of the difference between jam and jelly for our International members. Jam vs. jelly and then there are preserves too! All are made with fruit mixed with sugar and pectin The difference comes from the form the fruit takes.
In jelly, the fruit is in the form of fruit juice, so the product is set and is smooth and sometimes slightly opaque. In jam, the fruit is in the form of fruit pulp or crushed fruit. The product is not as stiff as jelly. Preserves are made of chunks of fruit set in a syrup (made of fruit juices) or in a jam.
As for the recipe, I believe it is stated to use the jam so the recipe would be true to the original way it was prepared.