In a wide, shallow baking dish, combine the low-sodium soy sauce, brown sugar, minced garlic, lime juice, sesame oil, fresh ginger, and crushed red pepper flakes. Give it a quick stir – you just want to dissolve that sugar. The resulting mixture will be a gorgeous, glossy marinade that’s bursting with flavor.

Once the marinade is well mixed, add your tilapia fillets to the dish. Ensure each piece is fully submerged in the liquid. This step is crucial for infusing the fish with flavor, so don’t skip it! Let the fillets marinate for about 20 minutes. You can do this while your oven heats up!

Preheat your oven’s broiler to high and position the rack so it’s closest to the heat source. After your fish has marinated, slide the baking dish into the oven. Broil the tilapia for about five minutes. Keep the oven door slightly ajar to ensure the broiler element stays lit.

Carefully turn the baking dish around—this helps achieve even cooking. Broil for an additional five minutes. If you see any juices starting to burn at the edges, just splash a little water into that spot to prevent further burning. Once done, the fish should be opaque and flaky.

When you plate up, spoon that glorious sauce from the baking dish over the fish for an added punch of flavor. If you have fresh cilantro, sprinkle it on for a fresh touch.