Ingredients

2 tablespoons red-wine vinegar 

2 teaspoons whole-grain mustard 

1/3 cup extra-virgin olive oil 

2 tablespoons capers, drained and rinsed 

1/3 cup lightly packed coarsely chopped fresh tender herbs, such as parsley, dill, tarragon, and chives 

1 large hard-cooked egg, coarsely chopped 

Kosher salt and freshly ground pepper 

Preparation

Stir together vinegar, mustard, oil, capers, and herbs. Top with egg; season with salt and pepper. Serve with poached, sauteed, steamed, roasted, or grilled fish.