Place the sliced onions in the bottom of the slow cooker. Mix all the spices except the Worcestershire Sauce and liquid smoke. Place the pork tenderloin in the slow cooker. Apply the spice mix to the pork tenderloin. Turn the pork and do it to the other side. Add a few dashes of the Worchestershire Sauce and 1 capfull of the liquid smoke. Place the slow cooker to cook according to the directions of your slow cooker. Serve as a slider or on crostini for an appetizer. Enjoy with a glass of wine. Bon Appetit.