Caramelized Onion Sauce

Caramelized Onion Sauce with Potato Rösti ¦ Photo Jack McNulty

A golden-brown roux-thickened sauce loaded with slightly caramelized onions is rich in a gentle, sweet, umami sort of way. This kind of sauce works extremely well with potatoes (especially a crispy Swiss-style rösti), grilled vegetables and as part of a pie filling…probably mixed with mushroo…