Check for and remove pin bones in salmon, if any. Season salmon with salt and pepper, then broil or grill for a few minutes on each side until fish is cooked to your liking (FDA recommendation is 145F)
While fish is cooking steam spinach until warm and wilted, about 10 minutes.
Prepare your favorite Hollandaise (see notes for my recipe)
Divide spinach on four plates, top with a salmon filet, and and spoon (or pour) hollandaise over both.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.