1. Whisk mayonnaise, mustard, salt, and pepper until smooth. Drain the tuna well and flake it apart with a fork. Stir the fish into the sauce and season to taste.
2. Wash the tomatoes thoroughly and slice them into thick rounds. Peel the onion and cut it into thin rings.
3. Wash the lettuce leaves and pat them dry gently with a kitchen towel.
4. Cut the bread slices diagonally in half. Layer six of these triangles with lettuce leaves, the tuna mixture, tomato slices, and onion rings.
5. Place the remaining bread triangles on top as lids. Make sure the corners of the top slices align with the corners of the bottom slices to keep the sandwich stable.
Nutrition per serving
kcal: 370
Protein: 24 g · Fett/Fat: 22 g · Carbs: 30 g
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