Tuna and shrimp salad sandwich

Name: Tuna and shrimp salad sandwich
Prep time: 5 min
Cook time: 5 min
Total time: 10 min
Yield: 2 servings
Cuisine: Global
Ingredients: 1 twist of Black pepper; 1 Canned tuna steak; 60 gr of Cooked prawns; 1 tbsp of Ketchup; 1 squeeze of Lemon juice; 2 tbsp of Mayonnaise; 2 Panini roll; 6 leaves of Romaine lettuce