Remove and discard root ends and 1 inch of top green portions of green onions, and set green onions aside.
Toss together hash browns, dill, and salt in a large bowl.
Heat 2 tablespoons oil in a large nonstick skillet over medium heat. Add hash brown mixture in an even layer, and cook 5 minutes or until lightly browned. (Do not stir.) Place a lightly greased baking sheet, greased side down, onto skillet; invert hash browns onto baking sheet. Place skillet back on heat. Slide hash browns back into skillet, cooked side up, and cook 5 more minutes or until golden brown.
Press hash browns down with a spatula to flatten. Remove from skillet onto same lightly greased baking sheet, and keep warm in oven at 300°. Sprinkle blackened seasoning evenly over fillets.
Cook salmon in 1 tablespoon hot oil in same nonstick skillet over medium heat 4 to 6 minutes on each side or just until fish begins to flake with a fork. Remove from pan onto serving plates.
Sauté green onions in remaining 1 tablespoon hot oil in same nonstick skillet over medium heat 4 minutes or until tender; remove from pan, and serve with salmon and hash browns.
Note: For testing purposes only, we used Old Bay Blackened Seasoning. Use a skillet with flared sides so the cooked hash browns slide out of the pan easily.