Step 1: On a large cutting board, spread out the finely shredded romaine lettuce. Evenly distribute the diced deli meat, cheese, cucumber, bell pepper, and red onion over the lettuce.
Step 2: Using a large, sharp chef’s knife or a mezzaluna, begin chopping all the ingredients together. Use a continuous rocking motion, gathering the mixture frequently, until all components are uniformly minced into small, bite-sized pieces. The goal is to have every ingredient integrated into the mix for the perfect chopped sandwich recipe experience.
Step 3: Transfer the chopped mixture from the cutting board to a large mixing bowl.
Step 4: In a small bowl, whisk together the mayonnaise (or Greek yogurt), Dijon mustard, red wine vinegar, olive oil, and dried oregano (if using). Season with salt and black pepper to taste.
Step 5: Pour the dressing over the chopped ingredients in the large bowl. Using a spatula or large spoon, mix thoroughly until all ingredients are well coated with the dressing. Taste and adjust seasoning if needed.
Step 6: Carefully slice your hero rolls or bread lengthwise, without cutting all the way through, to create a pocket. Fill each roll generously with the chopped sandwich mixture.
Step 7: Serve your ultimate chopped sandwich immediately and enjoy the perfect balance of flavors and textures in every bite!