That looks so good! Would it still be a Reuben if made on Sour Dough?
Considering that he made it with pastrami instead of corned beef, and mustard instead of Russian dressing, what difference would it make if it was on sourdough instead of rye?
IMHO, Once you change any recipe from what was originally created, you can no longer call it by the same name. Not saying it's a better or worse variation, it's just not the same as the original.
Another example of an abused recipe is Caesar Salad. Here's the original recipe for 4 people created by Chef Caesar Cardini. He created the original in 1924 for his Hollywood friends coming down to his restaurant in Tijuana, Mexico to avoid Prohibition: CAESAR SALAD
(The spelling is correct)
3 medium heads of Romaine Lettuce, Leafs left whole, chilled, dry, crisp
Dash of L & P Worchestershire sauce
5-6 TBSP Grated Parmesan Cheese
1/3 C Garlic Flavored Olive Oil
1 C Croutons
1-2 TBSP Wine Vinegar
Juice of 1 1/2 Fresh Lemons
1 raw Egg
Salt & Freshly ground pepper
The dressing was distributed evenly over the whole leaves. The Spiny Romaine was intended to give two things to his salad. The full length Romaine leaf served as a scoop and Cardini suggested eating the salad with your fingers. He never chopped the Romaine. Notice there are no anchovies in the recipe. The anchovy flavor comes from the L & P's.
Anything else is not "Caesar Salad!"