Set your oven to 180C / Gas 4. Then, in a large bowl, blend together the eggs, cream, creme fraiche, and parmesan. Stir in the garlic, nutmeg, and watercress, and then season to taste. If you don't have a non-stick pan you may need to oil it a little before pouring in the Tian filling. Pour the filling almost to the top of each muffin mould.
(Because the salmon is heavy and sinks to the bottom of the mixture, I found it easier to divide the salmon between the muffin moulds after pouring in the egg and cream filling to make sure that it was evenly distributed). Finally, place a decorative sprig of watercress on the top of each Tian and bake for 20-30 mins until they are just set and golden brown.