Preheat oven to 400 degrees F/204 degrees C.
Toss onions in 1/4 cup olive oil, 1 teaspoon salt, and 1/4 teaspoon of pepper. Place on baking sheet and roast until tender (approximately 20 minutes).
When onions are nearly done, toss lamb with remaining 1/4 cup oil, 2 teaspoons salt, and last 1/4 teaspoon of pepper.
Place all on hot grill and cook for four minutes; flip and continue grilling for three more minutes.
Serve chops with onions and a house salad.