Choose your meat. See some tips above.
In a bowl, combine the ingredients for the marinade: olive oil, vinegar, mustard, and seasonings. Mix well, to help emulsify the marinade and dissolve the salt. This is highly important to make sure the pork is evenly seasoned.
In a one-gallon Ziploc bag, add the pork and then pour in the marinade. Seal the bag tightly, trapping air outside of it.
Massage the meat around to ensure it is evenly coated, then push it around until it is in one flat layer.
Let it marinate for 8 hours, flipping the bag every hour to keep the meat marinating evenly.
Heat/prepare your charcoal grill to the range of 300ºF-350ºF. Grill the pork for 4.5 minutes each side, until slightly bouncy. It should reach a temperature of 150ºF-160ºF.
Let it rest for 10 minutes, then enjoy!