1. Mix both of the cheeses, the onion, horseradish, 1 of the tablespoon parsley, Worcestershire, salt to taste and 1/4 teaspoon pepper in a medium bowl until evenly combined. Form the cheese mixture into a ball, cover with plastic wrap and chill until firm and the flavors have blended, at least 4 hours or overnight.
2. Remove the cheese ball from the refrigerator up to 30 minutes before serving. Cook the bacon in skillet until crisp, transfer to a paper towel, and when cool crumble. Mix the bacon with the nuts and remaining tablespoon parsley in a shallow bowl. Roll the cheese ball in the mixture so that it is coated evenly. Serve with vegetables and crackers.
For a large gathering this recipe easily doubles for two smaller cheese balls or one large cheese ball.
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