Heat oven to 425 degrees F.
Coat the tenderloins with olive oil. Combine the grill seasoning, lemon zest and thyme. Rub the spice mixture into the tenderloin and roast 25 minutes. Remove and let juices settle then slice on an angle.
Melt butter in skillet over medium heat and saute apples for 12 to 15 minutes until very tender. Season with a pinch of salt and sprinkle the flour over the skillet, toss to combine. Squeeze the lemon juice over the skillet and sweeten with sugar.
Arrange the apples over the pork to serve.