Tuna Sauce for Pasta

In Italy, this sauce is a traditional component of vitello tonnato, a classic dish of cold braised veal sliced and garnished with this sauce along with oil-cured olives, lemon slices, and braised young vegetables. It’s also great with pasta, either hot or cool. I especially like it cold on a warm summer day. This recipe makes enough to sauce up to 1½ pounds dried pasta. If you are concerned about eating or serving a raw egg yolk, you can substitute one that has been coddled or even hard coo