Combine the cream cheese, goat cheese, onion, Worcestershire, and pepper in the bowl of a mixer and beat at slow speed until thoroughly combined. (alternatively, you can place these ingredients in a medium mixing bowl and stir to combine using a soft rubber spatula.) Transfer the cheese mixture to the refrigerator until chilled and quite firm, at least 1 hour and up to several days in advance.

Remove the cheese from the refrigerator and scoop into tiny portions about 3/4 inch wide, about 1 scant tablespoon, using a tiny portion scoop or spoon. Working quickly, roll the balls until smooth, then roll each truffle in the nuts until thoroughly coated. Transfer to a serving plate and refrigerate until ready to serve.

Serve with fruit and/or crusty bread.