Cook the fresh corn, either by grilling for about 10 minutes or simmering in boiling water for 5-7 minutes until tender.

Allow cooked corn to cool and then combine it in a large mixing bowl with diced tomatoes, chopped red onion, and finely chopped cilantro.

Drizzle lime juice and olive oil over the vegetable mixture, seasoning with salt and pepper, and toss thoroughly.

Gently fold in the diced avocado just before serving.

Serve immediately as a side dish or snack.