Step 1

Preheat the grill to high.

Step 2

Brush the lamb chops lightly on both sides with 1 tablespoon oil and season with salt and pepper. Place on a platter and let marinate while you prepare the sauce.

Step 3

Combine the chopped onion, the 1/4 cup oil, and the mustard in a small, heavy saucepan and bring to a boil, stirring. Reduce the heat to low and simmer gently until the onion is soft and lightly browned, about 10 minutes, stirring frequently.

Step 4

Thin the mixture to a sauce consistency with 3 tablespoons water, adding more, if needed. Remove from the heat and taste for seasoning, adding salt and pepper to taste, add sugar if the sauce needs it.

Step 5

Remove from the heat and cover to keep warm.

Step 6

When ready to cook, oil the grill grate. Arrange the lamb on the hot grate and grill, turning with tongs, until cooked to taste, 6 to 8 minutes per side for medium.

Step 7

Transfer the meat to serving plates or a platter and spoon the onion mustard sauce on top.

Step 8

Serve with a french baguette

Step 9

Serve immediately.