Heat the oil and butter in a skillet over medium-high heat. Add the rice, orzo and nuts and saute, stirring frequently, until roughly half of the rice and orzo is browned. Add the onion and cook for another two minutes. Add the chicken broth, salt and herbs and stir to combine.Bring it to a boil, reduce the heat to low, cover and cook as you would normally cook rice, about 15-20 minutes for white rice (longer if using brown rice) or until the rice is done.Fluff with a fork and serve immediately.