Cooked with onions.
Lyonnaise potatoes; potatoes lyonnaise.
Prepared with finely sliced onions; esp., designating potatoes prepared with fried onions.
Prepared in a style typical to Lyons.
The essential ingredients of salad lyonnaise are bacon, croutons and poached egg.
Origin of lyonnaise
From French (à la) Lyonnaise (in the manner) of Lyon from Lyon