Wash and dry the Roma tomatoes and English cucumber thoroughly. Chop the tomatoes into bite-sized pieces and slice the cucumber thinly.

Peel and dice the ripe avocado, and place all these ingredients into a large salad bowl.

Finely slice the medium red onion and add it to the bowl. Optionally soak the onion in cold water for 10 minutes.

Chop the cilantro (or dill) and sprinkle it over the vegetables.

In a small bowl, combine the olive oil and lemon juice, whisking until emulsified. Season with salt and pepper to taste.

Drizzle the dressing over the salad and toss gently to coat, being careful not to mash the avocado.

Add a final sprinkle of salt and pepper before serving.

Serve chilled or at room temperature, and enjoy the delightful balance of flavors.