Rinse 1 cup jasmine rice under cold water in a fine mesh sieve until the water runs clear; drain.
Heat 1 Tablespoon avocado oil in a medium saucepan over medium heat. Add grated ginger, 2 minced garlic cloves, and the white parts of the scallions; sauté about 1 minute until fragrant.
Add the drained rice to the pan and stir to coat in the aromatics and oil. Pour in 1.5 cups water, 1/2 tsp kosher salt, and 1/2 teaspoon toasted sesame oil; cover and bring to a simmer.
Once simmering, reduce heat to low, cover, and cook for 20 minutes or until water is absorbed; uncover and fluff before serving.
While rice cooks, whisk together teriyaki sauce: 1/4 cup low sodium soy sauce, 2 Tablespoons rice vinegar, 2 Tablespoons brown sugar, 4 minced garlic cloves, 4 Tablespoons grated ginger, 1/2 tsp sambal oelek, and 1 tsp cornstarch until sugar and cornstarch are dissolved; set aside.
Make sriracha mayo by stirring 1/4 cup mayonnaise with 1 Tablespoon sriracha in a small bowl; set aside.
Pat 1.5 pounds cubed salmon dry. Toss the cubes in 1/4 cup cornstarch until lightly coated, then drizzle with 1 Tablespoon toasted sesame oil.
Heat a large sauté pan over medium-high heat and add 2 Tablespoons avocado oil. Working in batches if needed, sear the salmon cubes 2–3 minutes per side until browned and crispy; avoid overcooking so centers remain slightly pink.
Return all cooked salmon to the pan, reduce heat to medium-low, pour in the prepared teriyaki sauce, and gently stir to coat. Cook 1–2 minutes until the sauce begins to thicken and glaze the salmon.
Assemble bowls: divide the ginger-scallion rice among bowls, top with crispy salmon, edamame, sliced cucumber, shredded purple cabbage, and avocado slices. Drizzle with sriracha mayo and sprinkle with sesame seeds before serving.