Savory salami and sharp provolone layered on a crusty sub roll make a high protein Italian deli staple. This bold, flavorful sandwich is a satisfying family lunch option.
Slice each sub roll lengthwise, leaving one edge attached. Toast cut sides under a broiler on high for 1-2 minutes until just golden and crisp.
Layer 2 oz sliced salami evenly along the bottom of each roll. Arrange 1 oz provolone cheese over the salami for each sub.
Slice romaine lettuce thinly, tomato into rounds, and onion into paper-thin slices. Pat dry any sliced vegetables to reduce moisture.
Layer lettuce, tomato, and onion over the provolone, distributing evenly between sandwiches.
Whisk together olive oil, red wine vinegar, oregano, salt, and pepper in a small bowl. Drizzle evenly over the vegetables and close each sub, pressing gently to hold the layers in place before serving.