Cut the avocados in half and remove the pit.
In a mixing bowl, combine the drained tuna, diced cherry tomatoes, chopped red onion, and diced cucumber.
Add the mayonnaise and lemon juice to the tuna mixture. Stir well until combined. Season with salt and pepper to taste.
Scoop the tuna mixture into the halved avocados, filling them generously.
Garnish with fresh cilantro if desired.
Serve immediately as a healthy meal or snack.
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