Cut out the insides of the sandwich bread, leaving about 1 cm from the edges and 10 cm from the bottom. Push the insides down firmly to create a solid base.
Pour in the meat sauce and place potatoes and broccoli inside. Give it a quick mix and top with the cheese. Squeeze out some mayonnaise around the border. Crack one egg into the center and season with black pepper.
Bake at 200 degrees C until egg is half cooked and still runny. (about 10 minutes)