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Combine treacle and rum with star anise, cinnamon stick, cloves and peppercorns in a small saucepan. Heat until you've reached a smooth mixture. Season the meat with pepper, salt and ground mustard seeds.
You can cook the meat in several ways. You can cook it sous vide, but most people don't have the right tools for this. If you don't have a sous vide stick, simply add the pork roast to a small oven dish and pour the sauce on top.
Cover with tin foil and add in an oven of about 70 degrees Celsius or 160 degrees Fahrenheit. The exact cooking time depends on the thickness of the roast, about 2,5 to 3 hours.
The intern temperature should be at least 53 degrees Celsius or 127 degrees Fahrenheit. Check regularly if the oven dish needs more liquid and add a layer of water if needed.
Transfer the roast out of the liquid and pour that through a sieve into a small saucepan. Keep the roast warm with tin foil. Throw out the spices and reduce the liquid until you've reached a beautiful treacle sauce.