- Preheat panini press while assembling panini. Mix mayonnaise, thyme and lemon peel in small bowl until well blended.
- Spread each slice of bread with mayonnaise mixture. Divide peaches, prosciutto, sopressata, cheese and watercress evenly among 4 of the bread slices. Top each with second slice of bread.
- Place 2 sandwiches at a time on panini press and close. Cook 2 to 4 minutes or until bread is golden brown with grill marks and cheese is melted. Serve warm.