Smoked salmon comes in two main types: solid (chunk) fillet and sliced. Choose whichever you prefer or whichever is available. If you use chunk, trim off any skin and then crumble the salmon with either fingers or a fork. If you use sliced, cut the salmon into thin strips about two inches long.
Pasta. Tagliatelle is in the title, but fettuccine will doespecially fettuccine 'nests'. I like to mix some green spinach nests with the plain beige nests just for the color and presentation. Whatever you select, the point is to choose long, wide, flat pasta.
Mace/nutmeg. Mace and nutmeg derive from the same plant, but their taste is rather different. Whichever you use, start with only a small amount (perhaps 1/8 teaspoon or so); more can be sprinkled on the finished dish or even onto individual servings.