Use ribeye steak for tenderness and flavor; freeze steak before slicing for thin slices; cook steak in batches to avoid overcrowding; caramelize vegetables slowly for sweetness; use provolone cheese for best melting; toast rolls to prevent sogginess. Variations include swapping cheeses, adding hot peppers or other vegetables, making it spicy, or using chicken or turkey instead of beef. Store leftovers in an airtight container for up to 3 days and reheat gently.