<human>:  How should I prepare a marinade for a roasted pork loin?
<bot>: To prepare a marinade for a roasted pork loin, you will need to combine a few ingredients to enhance the flavor. Start by combining olive oil, garlic, rosemary, thyme, sage, salt, and black pepper in a bowl. Once combined, rub this marinade over the pork loin, making sure to cover it completely. Place the pork in the refrigerator and allow it to marinate for at least four hours before roasting.