Lyonnaise Sauce is the traditional sauce of which cuisine?

Lyonnaise cuisine refers to cooking traditions and practices centering on the area around the French city of Lyon and historical Lyonnais culinary traditions.

The Lyonnaise Sauce is a finished sauce made with onions and white wine vinegar simmered in a basic demi-glace. The Sauce Lyonnaise pairs well with roasted meats, grilled pork, poultry dishes, and even grilled sausages.

Sauce Lyonnaise is a secondary sauce based on Sauce Espagnole (brown sauce) as the mother sauce. It originated approximately in the late 1500s. There are various people credited for developing it, some unlikely to have created it themselves, but rather their cooks were known for preparing it for their table.