Cracked Wheat Cooked with Onions

Name: Cracked Wheat Cooked with Onions (Bourghul Mfalfal)
Yield: Serves 2
Cuisine: Lebanon
Ingredients: 1 knob butter (optional); 2 cups water; salt to taste; 2 tablespoons vegetable oil; 1 onion, chopped; 1 cup burghul