Cook the pilaf according to the package directions.
Meanwhile, heat the oil in a large skillet over medium heat. Add the onions and cook, stirring occasionally, until soft, about 12 minutes. Remove from heat and stir in the dill and 1/2 teaspoon pepper.
Transfer the pilaf to a large bowl and fold in the onion mixture.
Stress-Less Tip: With a boxed pilaf mix, there's no need to sauté the rice or measure the seasonings.