A quick, approachable, and familiar dish that works well as an hors d'oeuvre, appetizer, or even a small meal. This recipe takes the flavors of a Ruben sandwich, one of the most quintessential Jewish dishes, and makes a flat bread out of it.
Add the onions, olive oil, salt, and pepper to the slow cooker and cook on high for 12 hours.
Combine the mayo and ketchup in a mixing bowl. Stir until thoroughly combined.
Preheat your oven to 350°F
Top the flatbread with the onions and then a layer of corned beef. Bake until the corned beef begins to crisp up.
Remove the flatbread from the oven and top with the sauerkraut, Russian dressing, and giardiniera. Slice in to strips or triangles and serve immediately.