Combine all of the ingredients, except fat, in the bowl of an electric mixer fitted with a dough hook. Beat at medium speed for about 1 minute, or until everything is well mixed. Or use a food processor, taking care not to puree the mixture or let it turn into a paste. The texture should be like finely chopped meat.

Use immediately or place in an airtight container, drizzle some of the reserved fat over the top, and store in the refrigerator for up to 2 weeks or more. It freezes well if there's any left. Smear on a wonderful baguette and eat along with Cornichons. (Maille brand is best)