To make the marinade, combine coconut milk, chopped mango, garlic, sriracha, lime juice, honey, olive oil and salt/pepper in a blender and mix until smooth. Mix in cilantro and reserve about a 1/4 cup of marinade to drizzle over the salmon when serving.: You will notice the blender whirring into a glossy, fragrant sauce, with the sweet perfume of mango and the sharp, green scent of fresh cilantro rising first. The texture should be silky and pourable, not grainy, and when you tilt the blender the marinade should flow in a ribbon rather than blob. This smoothness matters because a cohesive marinade coats the salmon evenly, guaranteeing consistent flavor. Listen for the blender to shift to a steady hum, and stop to scrape down the sides once so the garlic and honey are fully incorporated. A common mistake is underblending, leaving chunks that prevent even coverage, or overblending frozen fruit which can make the mixture too icy. Reserve a small portion before adding the herbs, so you can drizzle fresh flavor and contrasting temperature onto the cooked salmon , which lifts the finished dish.
Place the salmon in a shallow dish or bowl and pour the marinade over top, making sure to coat the salmon entirely. Cover and place the salmon in the fridge to marinate for 30 minutes or up to an hour.: As the salmon soaks, the marinade will cling like a glossy varnish, and the air around the bowl will take on sweet, citrus notes. You should see the surface of the fish become slightly paler where the acid from the lime and the oils have started to interact with the flesh indicating penetration. This step matters because brief marination lets the flavors seep into the top layers of the fish without breaking down the texture. Keep the fish chilled to prevent bacteria growth, and set a timer so you do not exceed one hour which can make the surface mushy. A typical error is marinating too long, which causes a mealy texture, or too briefly, which gives minimal flavor. If your marinade seems thin, pat the salmon dry first so it absorbs more readily.
While the salmon marinates you can make the salsa. In a medium bowl, combine all the ingredients for the salsa, cover and keep in the fridge until ready to serve.: When you fold the diced mango , red sweet pepper , jalapeños , red onion , green onions , cilantro , lime juice and zest together you will see a colorful mosaic of jewel tones and feel a refreshing citrus scent. The textures should remain distinct so each bite offers a crisp, juicy pop against the tender fish. The salsa benefits from resting, as the flavors meld and the lime slightly softens the onion bite. Avoid chopping ingredients unevenly, which can cause an unbalanced mouthfeel, and do not overdress the salsa or it becomes runny. Taste and adjust the acid or heat before chilling for the best result.
If you want to grill the salmon, place salmon skin side down on a grill (or grill pan) sprayed with oil and cook 5 to 6 minutes per side, until tender and flaky.: On the grill you will hear the satisfying sizzle as the marinade meets hot metal and smell caramelizing sugars turning to toasty aromas. The skin side down technique helps protect the flesh and encourages even cooking, while the timing here yields a tender interior and a slightly charred exterior. Look for the flesh to change from translucent to opaque and to easily flake when prodded with a fork. Use a fish spatula or tongs to turn gently, or you risk tearing. A common misstep is moving the salmon too soon, which causes sticking, or cooking too long, which dries it out. If flare ups occur, move the fish to a slightly cooler part of the grill to finish gently.
If you want to bake the salmon, place skin side down on a prepared baking sheet and bake at 400 degrees F for about 8 to 10 minutes. Turn the broiler on and cook for an additional 2 to 3 minutes, until edges of salmon are crisp. Using a fork, break the salmon up into large chunks and drizzle with reserved marinade.: Baking at 400 degrees F creates even heat penetration, producing tender, flaky salmon with a tender center. The brief broil at the end encourages caramelized edges, adding texture contrast. Watch closely during the broil, as those final minutes can move from golden to charred quickly; you want crisp edges not blackout spots. After removing, the fish should yield large, moist flakes when gently broken with a fork, and the reserved marinade adds a bright, cool counterpoint that ties the flavors together. A frequent error is overbaking, which strips moisture, or skipping the broil which leaves the surface pale and less interesting.
To assemble the tacos, divide the salmon among the tortillas, top with mango salsa and avocado slices (if desired). Enjoy!: When assembling, warm the tortillas until they are supple and slightly toasty so they fold without cracking. Layer a generous portion of flaky salmon , then spoon the vibrant salsa on top so the juices mingle with the fish, creating an immediate balance of warm and cool sensations. If using avocado , its creamy texture will round out the heat from the sriracha and the bright acid from the lime . Serve immediately while the fish is warm for the best contrast; waiting will dull the textural interplay. A common mistake is overfilling the tortillas which causes them to fall apart when picked up, so portion sensibly and present on warm plates.