Prep the produce
Peel and dice the mango into roughly ½-inch cubes. Dice the red onion, cucumber, and quarter the cherry tomatoes. Finely chop the jalapeño (remove membranes and seeds for milder heat). Chop the cilantro.
Mix the salsa base
In a bowl, combine mango, red onion, cucumber, cherry tomatoes, jalapeño, orange juice, lime juice, and cilantro. Toss gently. Season with sea salt and black pepper to taste.
Let flavors marry
If you can, rest the salsa in the fridge for 20–30 minutes. This step lets the citrus soften the onion and bring all the flavors together. No fridge time? No problem — it still tastes great.
Add avocado just before serving
Gently fold in the diced avocado right before plating. The avocado will stay green and pretty only if you add it at the last minute.
Fill the cups and garnish
Spoon the salsa into mini cups, endive leaves, or cucumber rounds. Garnish with extra cilantro, a tiny sprinkle of salt, and a lime wedge. Serve immediately.