1. In a large bowl, whisk the eggs and milk into an omelette. When they are well foamy, season with nutmeg, salt, and pepper.
2. In a non-stick pan, melt the butter. Pour in the beaten eggs and cook the omelette over medium heat, bringing the eggs from the sides to the center so that the mixture cooks evenly.
3. Remove from heat and place the smoked salmon on the entire surface of the omelette. Place a little sour cream on the salmon.
4. Cover the pan and serve the entire omelette in the pan. Cut into large portions.