Heat the butter in a large saucepan over medium heat. Add the onion, chili, and kale, season with ¾ teaspoon salt and ¼ teaspoon pepper, and cook, tossing occasionally, until tender, 8 to 10 minutes.
Add the rice and 1¾ cups water to the saucepan. Reduce heat and simmer, covered, until the rice is tender, 20 to 25 minutes. Fold in the lemon juice and dill.