In a small bowl, combine lemon juice, olive oil, minced garlic cloves, oregano, red wine vinegar, salt, and pepper. Put half in a large bowl or gallon zip lock back to coat the chunks of meat, and reserve the second half for basting meat after it is cooked.
Cut pork into 1 inch cubes.
Next, cut a lemon into thick slices and then quarter the slices. This will make thin lemon wedges. (optional) If you skip this step, add a good squeeze of lemon juice while grilling. and lemon slices in half of the marinade and allow to marinate for 15-30 minutes.
Place pork cubes, lemon slices, and half the marinade into a medium bowl and cover with plastic wrap. Let it marinate for 10-15 minutes.
Then, thread pork pieces and lemon slices onto the skewers. Add a lemon slice every 2-3 pieces of pork.
Heat a grill pan, griddle pan, or your outdoor grill on a medium-high heat.
Place the skewers onto the hot cooking surface and let cook for 3-5 minutes per side. Grill skewers until they are golden brown and have reached a safe internal temperature of 145° or higher.