Preheat the oven to 300°F. Wrap the tortillas in aluminum foil. Set aside.
In a small bowl, whisk together the vegetable oil, turmeric and cumin. Set aside.
Trim the steak of any large pieces of fat. Season well with the fine sea salt and freshly ground pepper. You can either grill your steak or cook it on the stovetop. For stove top, heat a large, seasoned cast iron skillet over high heat until almost smoking. Place in pan, searing on each side for 3-4 minutes for medium rare. For grilling, preheat grill to medium-high and grill on direct heat for 3-4 minutes on each side.
Remove and allow the steak to rest for 5 minutes. Thinly slice against the grain into 1/2 inch thick strips.
Meanwhile, heat the tortillas in the oven for 5 minutes. Remove and baste each on just one side with the oil and spice mixture.
To assemble, place a leaf of Bibb lettuce over the side of tortilla that was basted. Top with 2-3 slices of the beef, 1 tablespoon of mango salsa, a generous pinch of red cabbage and sprinkle of queso fresco.
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