Rinse the cherry tomatoes and cucumber. Halve and pit the avocados, then scoop them into a large bowl.

Dice the avocados into bite-sized pieces. Add halved cherry tomatoes, diced cucumber, and chopped red onion to the bowl.

In a small bowl, whisk together lemon juice and olive oil. Season with salt and pepper.

Pour the dressing over the salad ingredients and gently toss to combine.

Taste and adjust seasoning if necessary. Serve immediately or chill before serving.