In a small bowl, mix olive oil, lemon juice, finely chopped garlic, cumin powder, and a pinch of salt.
Taste and adjust the seasoning as needed. Keep in mind that the tuna and lentils already have some natural saltiness.
In a large mixing bowl, combine diced tomatoes, diced red onion, cooked and drained lentils, flaked tuna, and chopped coriander.
Gently toss to mix the ingredients evenly.
Drizzle the prepared dressing over the salad.
Toss gently to coat all the ingredients with the dressing.
Your salad is ready to serve—tasty, nutritious, and perfect for any meal.