Prepare the Avocado & Tuna Mix – In a bowl, add 1 small ripe avocado (halved, pitted, and peeled), 1 (5-ounce/140-gram) can oil-packed tuna (drained), 1 tablespoon freshly squeezed lemon juice, a pinch of kosher salt, and a pinch of freshly ground black pepper.
Mash & Mix – Using a fork, mash everything together until you reach your desired consistency. Adjust seasoning if needed.
Toast the Bread – Toast 2 slices of bread until golden and crispy.
Assemble the Toast – Evenly spread the avocado-tuna mixture over the toasted bread slices.
Serve & Enjoy – Finish with an extra squeeze of lemon juice and a sprinkle of salt and black pepper, then serve immediately!