Mix the spices together in a small bowl. Salt and pepper the ribs, then sprinkle with the spices. Place the pork in a sous vide bag and seal it. Place the bag in the water bath and cook for 1 to 2 days until tenderized.
To prepare the glaze, mix together all the ingredients in a bowl until combined well.
Take the sous vide bag out of the water and remove the cooked ribs.
Dry them off thoroughly, using paper towels or a clean dish cloth.
Lightly salt the spare ribs, then brush with the hoisin glaze. Quickly sear the ribs for 1 minute per side, then add more glaze and sear for another minute. Repeat a few times until the glaze has coated the ribs. Remove the ribs from the heat.Cut the racks of ribs into sections of 1 or 2 ribs and place them on a plate. Sprinkle with the cilantro and sesame seeds, then serve.