Two commas are needed exactly where you suggested, because “in turn” is a nonrestrictive phrase. In plain English, this means it does not restrict the meaning of the sentence in any way, and you could omit it completely without changing the sentence’s sense.
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are commas before the word or/and/& necessary when listing items…for example… sauteed with fresh herbs, white wine, butter and garlic…in a menu description that is not structured as a complete sentence ?? or when listing choices… to any entree you may add 4 shrimp fried,coconut or scampi style for $6.95???