Cook the bulgur wheat according to the package instructions if it has not already been prepared. Once cooked, fluff the grains with a fork and allow them to cool completely before assembling the salad.

Prepare the lemon-garlic dressing by whisking together olive oil, fresh lemon juice, minced garlic, salt, and black pepper in a small bowl. Mix until the dressing becomes well combined and fragrant.

In a large mixing bowl, combine the cooled bulgur wheat with drained tuna, diced cucumber, chopped tomatoes, fresh parsley, and sliced olives. Toss gently so the ingredients are evenly distributed.

Pour the lemon-garlic dressing over the salad and toss lightly until everything is coated. Serve immediately or refrigerate briefly to allow the flavors to develop before serving.