Pat the salmon fillets dry with a paper towel and cut them into even 1-inch cubes to ensure uniform cooking.
Whisk together the soy sauce, honey, sriracha, minced garlic, and water in a small bowl until the honey is fully dissolved and the sauce is smooth.
Place the salmon cubes in a shallow dish or bowl and pour the marinade over them, stirring gently to coat; let the fish marinate for at least 30 minutes in the refrigerator.
Heat a large non-stick skillet over medium heat with a small amount of oil, then add the salmon cubes while leaving the excess marinade in the bowl.
Sear the salmon for a few minutes on each side until a golden-brown crust forms and the fish is nearly cooked through.
Pour the remaining marinade into the skillet with the salmon and continue to cook for another minute or two until the sauce bubbles and thickens into a sticky glaze.
Divide the cooked white rice into four serving bowls and top each with a portion of the glazed salmon.
Arrange the sliced cucumber, edamame, and avocado around the salmon for a fresh and colorful presentation.
Drizzle the top of each bowl with sriracha mayo and finish with a sprinkle of sesame seeds and red pepper flakes before serving immediately.