In a medium-sized bowl, combine the tuna, mayonnaise, red onion, Sriracha sauce, Dijon mustard, and salt and pepper. Stir until ingredients are evenly distributed.
Toast the bread slices.
Divide the tuna mixture between the four slices of toasted bread.
Add desired toppings and condiments.
Enjoy!
Interesting Facts
Tuna is a great source of lean protein and essential vitamins and minerals.
Sriracha sauce is a popular hot sauce made from chili peppers, garlic, vinegar, sugar, and salt.
This sandwich is perfect for lunch, dinner, or a snack!