In a small bowl mix together the herbs and spices. Pat the pork roast dry with a paper towel, then rub the spice mixture evenly over the roast.
Heat the olive oil in a large skillet over medium-high heat. Add the roast and sear for 2-3 minutes on all sides.
Place the onions on the bottom of the slow cooker, then place the pork roast on top of the onion slices. Pour the broth into the pot and place the rosemary sprigs to each side.
Place the lid on to the slow cooker and cook on low for 6-7 hours, or until the roast is fully cooked and fork-tender. Discard the rosemary sprigs before serving.
Notes
Click on the time in the instructions to start a timer! StorageRefrigerate leftovers in an airtight container for 3-4 days. Freeze leftovers in a freezer-safe container for 2-3 months. Cooking Tips
My 4 pound pork roast took 6 hours on low to finish cooking and be very fork-tender. If you have a bigger or smaller roast, you may need to increase or decrease the cooking time.
I recommend cooking this on low, because the connective tissue in the roast will break down more effectively. A larger roast (more than 4 pounds) may take 7-8 hours to finish cooking.
I do not recommend using a frozen pork roast, because it is too thick to stay in the safe cooking temperature zone for the right amount of time.