Preheat the oven to 400 degrees F (200 ̊C).
Make the tamari sesame sauce: In a small bowl whisk together the tamari, maple syrup, toasted sesame oil, ginger, and sriracha. Measure out 2 tablespoons of the sauce and set it aside for brushing the salmon. To the rest of the sauce, add the sesame seeds—set this sauce aside for serving.
Make your rice: If you’re serving over my delicious sushi rice, prepare it now. As the rice cooks, move on to the next step (salmon!). Alternatively, you can make brown rice, white rice, cauliflower rice, or your favorite grain for a bed of rice.
Roast the salmon: Place the salmon fillets in a single layer on a parchment-lined baking sheet pan and season them lightly with a pinch of salt and pepper (go light on the salt because of the glaze). Brush half of the reserved sauce (about 1 tablespoon) over the salmon fillets. Roast the salmon for 5 minutes. Remove the pan from the oven and brush the fillets with the remaining 1 tablespoon of sauce. Bake until the fish flakes easily but is still rosy in the center, about 5-8 minutes longer (depending on the size and thickness of the fillets).
Serve: Scoop sushi rice into the center of shallow serving bowls. Transfer the cooked salmon fillets to the bowls (you can leave the skin behind or eat it—I love it!), and drizzle the salmon with the creamy sriracha sauce. Arrange the avocado, cucumber, and radishes alongside (now’s your time to get creative). Tuck in some seaweed snacks, if using. Drizzle everything with some of the reserved tamari sesame sauce (bring the rest to the table). Admire your masterpiece, then dive in.