Make the sweet chili lime dressing. Add all the ingredients to a small bowl and whisk until well combined. Set aside.
Slice or cube the mangoes. Slice the red onion and cucumber. Halve the tomatoes. Set ingredients aside.
Heat a griddle pan over medium heat. Add olive oil and swirl around the pan. Place the mango slices on the griddle. Drizzle 1 tablespoon of the chili lime dressing evenly over the mango slices. Grill the mango until they turn golden and crispy, flipping them so each side gets grilled.
Place the grilled mango slices into a large bowl and add the red onion, cucumber, tomatoes, and the dressing. Gently toss together with lime zest and grated ginger to combine. Garnish with fresh mint upon serving, if desired.
Notes
Alternatively, you can grill the mango on an outdoor grill. Gently toss the mango slices in the chili lime dressing before placing on the grill.