Remove any silver skin from the pork tenderloins, we don't want this in our steaks. Cut each tenderloin into 3 pieces.
Make the marinade by simply mixing all the ingredients listed. It is recommended to give the marinade a taste to make sure it's salty enough, as the tenderloin steaks are large.
Place the tenderloin steaks into a bowl with the marinade and use your hands to cover each piece properly.
First, be sure to grill the potatoes. Once finished, move them away from direct heat and start grilling the pork tenderloin steaks.
Grill from all sides, including the ends/tips. 3-4 minutes per side for medium, more if you want them well done.
Place the finished tenderloin steaks into a small pot, add some butter and let it melt. Toss the pot, cover with a lid and let rest for a few minutes.
Add the potatoes to a bowl, put some butter, thyme and rosemary in and mix carefully, as the butter needs to melt and coat the potatoes without breaking them.
Cut the steaks and serve with potatoes and desired sauce.