Heat the oil in a large skillet over medium-high heat. While skillet is heating, coat the roast with garlic powder, black pepper, and mustard powder. Add the roast to the skillet and brown on both sides (about 5 minutes per side).
Remove roast from skillet and add to crock pot. Pour remaining ingredients over the roast. Cover and cook on low for 6-8 hours.
Serve over rice and top with sesame seeds and sliced green onions if desired.
Weight Watchers Freestyle = 12 Points per serving for 8 servings