01 - Gently rinse and pat dry the blueberries. Halve them if desired for easier eating.
02 - In a mixing bowl, combine blueberries, cucumber, red onion, jalapeño, and cilantro.
03 - Add lime zest and juice, salt, and pepper. Stir gently to mix all ingredients evenly.
04 - If using, add diced avocado and/or red bell pepper, folding in carefully to avoid mashing.
05 - Taste and adjust seasoning as needed.
06 - Chill for 10 minutes before serving for best flavor, or serve immediately with tortilla chips, grilled fish, or chicken.