Heat 4 large ovenproof plates by placing them in boiling water or heating in the oven. Take the plates out of the water. Place the salmon slices on the plates, and place lids or other plates on top.
Let stand for 2-4 minutes. The salmon slices will start to change color.
Squeeze over lemon juice and add a sprinkle of nutmeg. Add mustard and crème fraîche to the plates. Serve immediately, with Fresh Asparagus and Cucumber Salad.