Prepare all ingredients by dicing the tomatoes, red onion, jalapeño (if using), avocado, and cilantro.

In a mixing bowl, combine the rinsed black beans with the diced vegetables.

Add lime juice, olive oil, and salt; gently toss to mix without mashing the avocado.

Taste and adjust seasoning if necessary.

Serve immediately with tortilla chips or let it chill in the fridge for an hour to enhance flavors.