Measure and prepare ingredients for marinade. Add all marinade ingredients to a mason jar and shake well to combine.
Place cut up pork loin into a plastic zip-lock bag and pour marinade into bag to cover pork. Zip the plastic bag, removing air. Place bag with meat and marinade into the refrigerator for a minimum of two hours. Mix two or three times over the 2 hours.
Quarter 1/2 red onion, pull apart and place in a bowl. Add 1 tbsp extra virgin olive oil and salt and pepper to taste. Mix well to cover onion with olive oil, salt and pepper. Set aside.
Place 4 wooden skewers into water to soak.
Once pork is done marinating, place on skewers alternating with pieces of red onion.
Heat your grill to medium-high. Grill Souvlaki for 10-15 minutes turning every 3-4 minutes until they are cooked through. Please note that the USDA recommends cooking pork to a minimum internal temperature of 145° F as measured with a food thermometer before removing meat from the grill. Allow meat to rest for at least 3 minutes before serving.
Squeeze some fresh lemon juice onto your pork after you have removed it from the grill.