Make the marinade by combining the soy sauce, ketchup, garlic, salt, sugar, ground black pepper, and lemon juice in a bowl. Mix well.
Arrange the pork chops in a ziploc bag or resealable plastic bag. Pour the marinade inside the bag. Let the air out and seal the bag. Place in the fridge to marinate for 5 to 8 hours.
Separate the pork chops with the remaining marinade. Place the marinade in a bowl and then add cooking oil. Stir.
Heat-up the grill. Grill the marinated pork chops in medium heat for 3 to 4 minutes per side while basting with the remaining marinade and oil mixture. Do this step twice and add more grilling time as needed.
Transfer to a serving plate. Serve!
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