In a high-speed blender, combine all of the pastor sauce ingredients and blend until smooth. Reserve 1 cup of the sauce and store in the fridge until ready to use when cooking and serving the pork.
To a large bowl, add the cubed pork, salt, and pepper with the remaining pastor sauce. Cover and marinade in the fridge for at least 2 hours.
Assemble the Skewers:
Next, thread the pork and pineapple onto the skewers. Hold two skewers side by side, parallel to one another, upright and carefully thread the pork and pineapple onto the skewers. I like to do 3 to 4 cubes of pork, then a pineapple cube, then repeat. Using two skewers together makes it easier to flip and less likely to spin or slither off.
Grill the Skewers (Gas-Grill Method):
Heat grill over medium-high heat (350-400℉) and oil the grill grates. To do this, dip a wadded paper towel in a little avocado oil and, using tongs, wipe the oil evenly over the grate. Be careful not to use too much oil, because that's a sure fire way to start a good flare-up—a little goes a long way here.
Place the pork skewers directly on the preheated grill grates. Line up the skewers side by side without overlapping. Cook the pork skewers, brushing with ½ cup of the reserved sauce (saving the rest for serving) every so often, for 3 to 4 minutes. Flip the skewers and grill another 3 to 4 minutes on the other side, painting with sauce. When done, the edges will be slightly charred and the middle of the pieces should be soft, juicy, and cooked through.
Grill the Skewers (Weber XL Searwood Method):
Add Mesquite pellets to the grill and preheat to 375℉
Place the pork skewers directly on the preheated grill grates. Line up the skewers side by side without overlapping. Cook the pork skewers, brushing with ½ cup of the reserved sauce (saving the rest for serving) every so often, for 3 to 4 minutes. Flip the skewers and grill another 3 to 4 minutes on the other side, painting with sauce. When done, the middle of the pieces should be soft, juicy, and cooked through.
To Serve:
Serve over cilantro-lime rice and drizzle with a bit of the remaining pastor sauce. Add a scoop of guacamole alongside the skewers. Top with pickled red onions, a little cilantro and a wedge of lime!
Notes
Ancho Chile Note: Ancho chile powder packs a punch of heat. If you want milder, use 1 teaspoon.