Gringas are a variety of taco with a quesadilla base. It consist of a flour tortilla filled with cheese, "al pastor" meat (marinated pork), and pineapple slices. It is then grilled in the same manner as a quesadilla.
To marinate the meat: In a blender, combine the achiote paste, chiles, canning sauce, oil and 3/4 cup water. Blend until smooth. Use 1/3 of the marinade to smear over both sides of each piece of meat (refrigerate the rest of the marinade to use on other meat or fish). Cover and refrigerate for at least an hour.
To cook the meat, you can grill it an high heat or use a grilling pan on the stove. Over high heat, sear the meat for about one minute per side (until you can see brown grill marks) and set aside. Cut into 1/4- to ½ inch pieces or slices and reserve.
On the same grill, sear the pineapple slices until you see the grill marks. Set aside.
To build the “gringas”: Put some sliced meat on a flour tortilla and pour a handful of shredded cheese over it. Cover with another flour tortilla and warm them on the grill or a pan, over medium heat, for about a minute per side or until the cheese is melted and the tortilla is golden brown. Set aside.
To serve, cut each piece into half or quarters. Garnish with a few slices of pineapple, chopped cilantro and sour cream. You can always add green or red salsa, and avocado.