Preheat the oven to 450°F.
Add the salmon, lemon zest, dark soy sauce, minced garlic, and honey to a bowl.
Toss everything together until the salmon is evenly coated in the sweet, garlicky lemon glaze.
Spread the salmon pieces onto a sheet pan.
Bake for 10–15 minutes, until the salmon is caramelized and flaky.
Add the cucumber, mango, red onion, cilantro, lemon juice, salt, and olive oil to a bowl.
Mix everything together and let the flavors mingle while the salmon bakes.
Divide the fluffy white rice between serving bowls.
Add the glazed salmon and mango cucumber salsa.
Finish with sliced avocado, if desired, and serve immediately.