In a medium bowl, combine ground lamb, salt, and pepper.

Shape the mixture into 6 equal-sized patties.

Preheat broiler.

Place patties on a broiler pan.

Broil 3-4 inches from the heat source for 3-5 minutes on each side, or until the patties reach the desired doneness.

While the patties are broiling, slice the onion.

In a small skillet, melt 3 tablespoons of butter over medium heat.

Add the sliced onions to the skillet and saute until soft and translucent.

Remove the sauteed onions from the skillet and keep warm.

In a small saucepan, combine the crumbled Roquefort cheese, 1 tablespoon of butter, chopped fresh parsley, and flour.

Stir the ingredients together until well combined.

Add the sour cream to the saucepan.

Heat the sauce over low heat, stirring constantly, for 1-2 minutes, or until it is just warmed through and slightly thickened.

To serve, place the sauteed onions on top of the broiled lamb patties.

Spoon the Roquefort cheese sauce generously over the onions and patties.

Serve immediately.