In a bowl, mix together 1 tbsp smoked paprika, 1 tbsp dry herbs, 1 tbsp meat or barbecue seasoning and 1/2 tbsp salt.
With a small knife, make 8-10 cuts through the meat. Tuck the garlic cloves into the cuts.
Use your hands to run the pork shoulders with the seasoning.
With a silicon brush, coat each piece of meat with a layer of mustard from al sides.
Place the pork shoulders into a dish. Cover with cling film, trying to avoid it touching the meat.
Refrigerate for 5-8 hours.
Take the meat out and leave at room temperature for an hour.
Remove the cling film and wrap the meat into foil. Make sure there is enough wrap to avoid any leaking.
Send the pork into a cold oven and turn the heat on to 180C. Roast for 1.5-2 hours.
Switch off the heat and leave the meat inside the cooling oven for another two hours.
Unwrap the foil and discard all liquid.
Place the roast on a plate, cover with cling film and refrigerate for a minimum of four hours.
When ready to eat, slice and serve with horseradish or mustard.