Place the farfalle into a large mixing bowl.
Slice the ham and turkey into very thin 1-inch-square pieces and add to the bowl.
Slice the cheese into very thin 1-inch-square pieces and add to the bowl.
Add the onion, garlic and pickle.
In a separate mixing bowl, combine the vinegar, mustard and horseradish. Gently whisk in the olive oil to make an emulsion. Pour over the pasta, turkey, ham and cheese mixture and toss gently to coat.
Season with the salt and pepper to taste and toss gently to coat.
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