Start by removing the stems from the chillies. Remove as many of the seeds as you can (I still had a few), then cut the chillies into small pieces and set them aside.
Next, add the cinnamon, clove, peppercorns, oregano and cumin seeds to a warm frying pan. Toast for 15 to 30 seconds until fragrant, then transfer to a spice grinder or pestle and mortar and grind to a fine powder.
In the same pan, toast the torn chillies for 30 seconds until they start to smoke. Transfer to a bowl, cover with hot water and leave to soak for 20 minutes until soft and pliable.
Add the unpeeled garlic cloves to the pan and toast until they begin to char and have softened slightly (about 8 minutes). Remove from the heat and leave until cool enough to handle, then peel and discard the skins.
Drain the chillies and place them in a blender with the ground spices, garlic cloves, vinegar, achiote and orange juice. Blitz to a puree, then massage the mixture into the pork steaks. Cover and leave in the fridge overnight to marinate.
Take the pork out about an hour before your want to start cooking. In the meantime prepare the BBQ and Rotisserie.
When the coals are ready add the Rotisserie spit to the BBQ and cook the pork. Mine took me around 1 hour 45 minutes, but I would encourage you to cook to temperature. I was aiming for 70°C.
Once ready, remove from the BBQ and place the spit on a large chopping board and cover with foil for 10 minutes (leaving it on the spit).
At this stage start warming your corn tortillas in preparation for the pork.
After 10 minutes, slice the pork. I did this whilst it was still on the spit. Once you have sliced the meat start constructing the Tacos.
On the base, I put sliced gem lettuce, topped this with this pork and then added some diced pineapple, sliced Al Pastor onions and coriander. I also had some Rancheros sauce and Tomatillo Salsa to top.