Definition: Lyonnaise is a French dish that originated in the region of Lyon, France. It is typically made with duck or chicken and can be enjoyed as a main course or as a side dish. The dish is often served with garlic mashed potatoes, green beans, and onions, and it's often paired with bread or a salad. Lyonnaise is known for its rich flavor and creamy texture, making it a popular choice among French cuisine enthusiasts.