Fill a large pot with water and add a generous pinch of salt. Place the pot over high heat and bring the water to a rolling boil. Once boiling, add the pasta and cook it according to the package instructions until it becomes al dente, meaning tender but still slightly firm when bitten. Stir occasionally while it cooks to prevent the pasta from sticking together.

Once the pasta is cooked, carefully pour it into a colander in the sink to drain the hot water. Allow the pasta to sit for a few minutes so the excess moisture drains away and it cools slightly. Slightly cooled pasta helps prevent the vegetables from wilting when mixed.

While the pasta is cooling, wash the cherry tomatoes thoroughly under cool running water. Pat them dry with a paper towel, then slice each tomato in half. This helps release their natural sweetness and allows them to blend better with the rest of the salad.

Take the cucumber, rinse it under water, and pat it dry. Slice the cucumber lengthwise and then dice it into small bite-sized pieces. The crisp cucumber adds a refreshing crunch that balances the richness of the tuna and olive oil.

Peel a small section of red onion and slice it very thinly using a sharp knife. Thin slices help distribute the onion flavor evenly throughout the salad without overpowering the other ingredients.

Rinse the fresh parsley and shake off any excess water. Place it on a cutting board and finely chop it with a knife. Fresh parsley adds bright Mediterranean flavor and a fresh herbal note.

Take the roasted red pepper and slice it into thin strips or small pieces. Roasted peppers add a slightly smoky sweetness that enhances the overall flavor of the salad.

Cut the avocado in half and remove the pit carefully. Scoop the flesh out with a spoon and place it on the cutting board. Dice the avocado into small cubes. For best results, do this step shortly before mixing so the avocado stays fresh and green.

Place the slightly cooled cooked pasta into a large mixing bowl. This bowl should be large enough to allow you to toss the salad without spilling ingredients.

Open the cans of tuna and drain the liquid completely. Add the tuna to the bowl with the pasta. Use a fork to gently break the tuna into chunks so it spreads evenly throughout the salad.

Add the prepared vegetables to the bowl: cherry tomatoes, diced cucumber, sliced red onion, chopped parsley, roasted red pepper, and roasted eggplant. These ingredients provide color, texture, and Mediterranean flavor.

In a small bowl, prepare the dressing by combining olive oil, fresh lemon juice, salt, and black pepper. Use a fork or small whisk to mix everything together until the dressing becomes slightly emulsified.

Pour the dressing evenly over the pasta and vegetable mixture. The olive oil and lemon dressing will bring all the flavors together while adding brightness and richness.

Using a large spoon or salad tongs, gently toss the mixture so that the dressing coats all of the ingredients evenly. Be careful not to mash the vegetables while mixing.

Add the diced avocado pieces to the bowl and gently fold them into the salad. Mix carefully so the avocado stays intact and creamy.

Taste the salad and adjust the seasoning if needed by adding a little more salt, pepper, or lemon juice.

Serve the pasta salad immediately for the freshest flavor, or cover the bowl and refrigerate it for about 30 minutes if you prefer it chilled. Chilling allows the flavors to blend even more.