I found this recipe on my all-time favorite website: Cooking Light. It sounds like a lot of work, but it’s pretty easy to put together and is good for feeding a crowd.
Preheat oven to 425°
Prepare pork Sprinkle pork with pepper and salt on all sides. Bake pork in preheated oven until thermometer registers 145° (slightly pink)
Let roast stand for 5 minutes. Cut crosswise into 16 slices. Combine port and Mojo marinade in a medium bowl. toss to coat port.
Pickled onions Combine vinegar, 3 tablespoons water and sugar in a small saucepan. Bring to a boil, then remove from heat. Add onion and let stand for 10 minutes
Put together Working with one tortilla at a time, toss in a pan until tender and blackened in spots. Arrange 2 pork slices in center of each tortilla, top with about 2 tablespoons of the pickled onions, 4-5 jalapeno slices, 2 avocado wedges,and 1 1/2 teaspoons crema.