Drain the steamed spinach (8–9 ounces) thoroughly: place in a fine-mesh sieve or on several layers of paper towels and press or squeeze out as much excess water as possible. Transfer the drained spinach to a bowl.
Break or flake the broiled salmon steaks into pieces and divide the salmon evenly into four portions. Keep warm or set aside.
Poach the 4 eggs: bring a wide, shallow pan of water to a gentle simmer, slip each egg into the water (one at a time), and cook until the whites are set and yolks reach your desired doneness (about 3–4 minutes for runny yolks). Remove eggs with a slotted spoon and drain briefly on paper towels.
Divide the drained spinach into four equal portions and place one portion on each serving plate, forming a nest or flat layer.
Top each spinach portion with one portion of the broiled salmon, then place one poached egg on top of each salmon portion.
Spoon hollandaise sauce over each egg and season with salt and pepper to taste. Serve immediately.