Cut the cucumber by first cutting off the two ends and then cut it in half.
Then, cut the cucumber in half and use a spoon to remove the seeds.
Cut the cucumber into small cubes.
In a large bowl combine the mango, red onion, cilantro, cucumber, jalapeno, tomato, tajin, and a sprinkle of salt and pepper.
Drizzle in about 1 tablespoon or so of olive oil and squeeze in 1/2 of a lemon.
Use a spoon to toss everything together.
Adjust the spices, salt, olive oil, and lemon as needed. This will vary based on how you like your salsa.
Serve with Chips!