A loaded roast beef po'boy on crusty French bread with gravy and debris is a high protein New Orleans classic. This hearty, family-style sandwich delivers bold Southern flavor.
1. Preheat oven to 350°F. Warm the French bread for 8–10 minutes until the crust is crisp and the inside is soft.
2. In a saucepan, melt butter over medium heat, then add beef gravy. Bring to a gentle simmer while stirring, then add black pepper and salt. Maintain a low simmer to keep the gravy hot.
3. Add sliced roast beef to the simmering gravy, reduce heat to low, and gently fold to coat every slice—this keeps the beef moist and infuses flavor. Cook for 5 more minutes.
4. Slice the warm French bread lengthwise. Generously spread beef and gravy 'debris' onto each half, ensuring some of the gravy soaks into the bread.
5. Top with lettuce, tomatoes, and pickles as desired. Sprinkle hot sauce over the sandwich, close it, and cut into portions. Serve immediately for best texture.