Carefully slice off the top ¼ to ⅓ of the watermelon to create a bowl, then scoop out the flesh.

Cube the scooped watermelon flesh to yield about 1 cup.

Wash and dice cucumbers and bell peppers, and finely slice red onion.

In a mixing bowl, combine diced watermelon, cucumbers, bell peppers, onion, cilantro, lime juice, jalapeño, salt, and black pepper.

Mix thoroughly and adjust seasoning to taste.

Transfer the salsa to the watermelon bowl and serve with tortilla chips or as a topping for tacos.