What prevents the base from getting soggy on a canapé?

Using compound butter as a base for a canapé serves the purpose of preventing the base from becoming soggy due to its unique properties. Compound butter, which is essentially softened butter mixed with various flavorings, acts as a barrier when spread on the base ingredient of a canapé, such as a cracker, bread, or vegetable.

This barrier is effective because it’s relatively high in fat content, which helps to repel moisture from toppings such as dips, spreads, or moist ingredients like tomatoes or pickles. When compound butter is applied, it seals the base, allowing the flavors from any toppings to interact without soaking into the base itself. As a result, the integrity of the canapé remains intact, ensuring that each bite retains its texture and does not become mushy.

Other options listed, such as mayonnaise, olive oil, and mustard, do not serve the same sealing function as compound butter. While they can add flavor and contribute to the moisture of the topping, they are more likely to facilitate moisture absorption into the base, leading to sogginess over time. Therefore, compound butter is the preferred choice for maintaining the structural quality of a canapé.