Whisk the oil, vinegar, dijon, and oregano in a bowl. Season with salt and pepper to taste.
Mix the mayo with thyme and season with salt and pepper to taste
Drizzle the vinaigrette onto both inside surfaces of the roll. Then spread the mayo onto both insides.
Layer with arugula, tomato seasoned with salt and pepper, oregano, ham, pepperoni, cheese, pepperoncini, and onion.
Cut in half, and serve with chips, pickle, and sparkling water.