Prepare the salad: In a large mixing bowl, combine the chopped cucumber, avocado, tuna, and red onion. Sprinkle with fresh parsley.
Make the dressing: In a small bowl or jar, whisk together the olive oil, lemon juice, salt, pepper, and oregano (if using) until well blended.
Toss and serve: Pour the dressing over the salad and gently toss to coat. Taste and adjust seasoning if needed. Serve immediately.
Notes
Use ripe but firm avocados - they should be creamy but still hold their shape when cubed. If they’re too soft, the salad can turn mushy.
Drain tuna well - I always press out extra liquid so the salad doesn’t get watery.
Chop cucumber into even pieces so every bite has the perfect crunch.
Add extras for variety – sometimes I add cherry tomatoes, canned white beans, a sprinkle of feta, or swap parsley for dill when I want a little change.
Make it a meal – Sometimes I serve it with whole-grain crackers, as a sandwich, or stuffed in a pita.