Salmon in Mustard Sauce with Savory Potatoes - a deliciously complementary combination perfect for a weekend dinner.. I used to make Salmon with Mustard Sauce in my first restaurant in Queens, Buonavia. It is deliciously simple and easy to prepare. The mustard sauce adds just the right amount of sophistication, complexity, and acidity. And, who doesn’t like roasted potatoes? Well, this recipe is all about the delicious flavor of roasted potatoes packed with a Mediterranean punch, and it's the pe