Peel the cucumber in to 20 thick discs. The amount of discs depends on the length and girth of the cucumber, use two smaller ones if needed.
1 large cucumber
Drain the tuna and place in a medium bowl.
1 can Wild-caught albacore tuna
Chop the onion, garlic and basil leaf. Add to a skillet and lightly saute until garlic is golden. If you are short on time, these ingredients can also be kept raw and added to the tuna directly. Add mixture to the tuna once done.
1 small red onion, 2 cloves garlic, 1/4 cup fresh basil
Mash the tuna and onion mixture with vinegar, lemon juice and oil. Season with salt and pepper. Mix well, taste and adjust as desired.
2 teaspoons raw apple cider vinegar, 2 teaspoons lemon juice, 2 teaspoons extra virgin olive oil, 1/2 teaspoon salt, 1/4 teaspoon ground black pepper
Spoon portions on top of each cucumber slice and serve immediately. Store leftovers in the refrigerator.