4 lb fingerling or small boiling potatoes
2 teaspoons sugar
4 tablespoons white-wine vinegar
1/3 cup finely chopped shallot
2 tablespoons coarse-grained Dijon mustard (not whole-grain)
2 tablespoons vegetable oil
potato, salad, mustard

3/4 cup dry white wine
1/4 cup butter, cut into small pieces
1 teaspoon Old Bay seasoning
1 2-pound center-cut skinless salmon fillet

1/3 cup spicy brown mustard (such as Gulden\'s)
1/4 cup (packed) golden brown sugar
salmon, mustard, brown

4 (6- to 7-oz) pieces center-cut salmon fillet (1 1/4 inches thick), skinned
1 tablespoon vegetable oil
3 tablespoons water
2 tablespoons Dijon mustard
2 tablespoons pure maple syrup
2 garlic cloves, finely chopped
2 teaspoons mustard seeds
1/4 cup chopped scallion greens
salmon, mustard, maple