Final answer:
Assuming the term 'American Jack' refers to Monterey Jack cheese, there is no specific garnish for it as it is often an ingredient rather than a garnish. It can be paired with tomatoes, parsley, or paprika when used as a garnish.
Step-by-step explanation:
If by American Jack you are referring to the popular sandwich topping also known as Monterey Jack cheese, then this question pertains to a culinary item typically used in the Arts, specifically culinary arts. However, if this term refers to something other than the cheese, please provide additional context for an accurate answer. When it comes to the term 'garnish,' this typically refers to an item or substance used as a decoration or embellishment on a food dish. In the context of Monterey Jack cheese, there might not be a specific garnish associated with it as it is often used as an ingredient in cooking to add flavor rather than as a final garnish. Nonetheless, in American cuisine, when using cheese as a garnish, common pairings might include a slice of tomato, a sprig of parsley, or a dusting of paprika depending on the dish being served.