What is typically paired with the grilled chicken to enhance its flavor?

The typical pairing with grilled chicken that enhances its flavor is a lemon butter sauce. This sauce complements the natural flavors of the chicken by adding richness and a refreshing citrus note that can brighten the dish. The combination of butter and lemon works well together, as the acidity of the lemon balances the fat of the butter, creating a harmonious and delicious flavor profile that elevates the grilled chicken experience.

The other options do not provide the same complementary effect. Ketchup, while a common condiment, does not suit the sophisticated profile of grilled chicken. Béarnaise sauce, while flavorful, is more traditionally paired with steak rather than chicken, and mozzarella cheese is not a typical accompaniment for grilled chicken, as it might overwhelm the dish instead of enhancing it. The lemon butter sauce shines as the most fitting choice to enhance the grilled chicken's flavors.