In a large mixing bowl, combine the halved cherry tomatoes, diced English cucumber, and mozzarella pearls.
In a separate small bowl, whisk together the basil pesto, extra virgin olive oil, and lemon juice until fully emulsified.
Gently add the cubed avocado to the vegetable mixture, taking care not to mash the flesh.
Drizzle the pesto dressing over the salad ingredients.
Season with salt and black pepper, then use a rubber spatula to gently fold the ingredients until evenly coated.
Garnish with fresh basil chiffonade and serve immediately to maintain avocado texture and color.