Buy the best-smoked salmon you can find for this recipethe way the rich fish plays against the delicious tanginess of crme fraiche is just wonderful. Crme fraiche is available in the cheese section of the dairy section of most supermarkets, and you can also order it online. Its smooth and tangy, and it can be used in recipes either savory or sweet. After you fill a plastic bag with the mixture, let the kids pipe the spread onto slices of cucumber or small toasts or even mini potato pancakes. Its a great task for even little ones. You can garnish these with minced chives if you like.