- In a large bowl, coarsely crush the eggs with a fork. Add the mayonnaise and combine while crushing until creamy. Stir in the Parmesan cheese and green onion. Season with salt and pepper.
- Spread the egg mixture on half the bread slices and cover with the remaining slices. Cut each sandwich into 4 wedges.
- On one or two long serving dishes, place the sandwiches, side by side in a row as shown. Cover the two cut surfaces with a little mayonnaise. Sprinkle with fresh herbs, pressing gently on the sandwich.
If you make the sandwiches in advance, spread the inside of the slices of bread with a thin layer of softened butter. It will acts as an insulator, which will prevent soggy bread. Make the decoration at the last moment.