Crush lemon grass and cut in half. In a large sauce pot, add lemongrass, water, and the 1 tablespoon rice. Cover and bring to a boil; lower heat and simmer for 30 minutes. Cut Beef slices into 2-inch strips; place in a large soup bowl. Add lime juice, Sugar, chili pepper, fish sauce, basil, and green onions. Pour hot stock into bowl. Stir before serving. Serve with cooked jasmine rice.