Wash all the produce. Cut the cucumber in quarters lengthwise, then dice it and add to a large bowl.

Slice the cherry tomatoes in half and toss them in.

Peel and dice the avocados, then thinly slice the red onion. Add both to the bowl.

Juice the lemon over the bowl, drizzle with olive oil, and season with salt and pepper.

Gently mix everything together until well combined. Serve chilled or at room temperature.