What two ingredients make up the shallot fennel relish?

The correct answer identifies shallots and celery as the two ingredients that create the shallot fennel relish. This combination highlights the balance of flavors, with the sweetness and mild onion flavor of the shallots complementing the crisp, slightly anise-like notes of the celery, which helps to create a refreshing and flavorful relish. Shallots serve as a base, providing a delicate depth of flavor, while celery adds texture and an herbaceous quality, enhancing the overall taste of the relish.

The other ingredient options such as carrots, onions, and garlic do not pair with fennel in this specific relish preparation, therefore they do not belong in this context. Carrots are generally sweeter and might not provide the savory balance needed. Onions, while similar to shallots, would alter the specific flavor profile intended for the relish, and garlic is often used for its strong aromatic properties, which might overpower the more delicate balance sought in this particular recipe.