Place the ham and gherkins in the bowl of a food processor. Pulse to chop.
Transfer the ham mixture to a large bowl.
Add the mayonnaise, mustard, parsley, scallions, celery and red onion. Stir to combine.
Season with salt and pepper, to taste.
Transfer to an airtight container and chill until ready to use.
Notes
Ham Salad can be frozen in an airtight container for up to 2 months. Fresh Ham salad will last in the refrigerator in an airtight container for up to 5 days.