Cook beef in a saucepan over medium high heat, stirring until it crumbles and is no longer pink. Drain and pat dry with paper towels. Wipe pan clean.
Add 3 cups water, salt, and cumin to saucepan. Bring to a boil, add rice, cover, reduce heat, and cook 20-25 minutes or until water is absorbed and rice is tender. Stir in beef, lime rind, and lime juice. Serve salad with desired toppings.