PLACE pork slices in a 13 x 9 x 2-inch baking dish.
In a mixing bowl, ADD water; STIR in chili powder, red pepper, garlic, cumin, oregano and salt.
POUR mixture over pork slices, TURNING slices to coat.
COVER; REFRIGERATE at least eight hours, TURNING slices occasionally.
BAKE, covered, 325 F for one hour (*see note)
UNCOVER; BAKE another 1 to 1 1/2 hours; SPOON marinade over slice occasionally.
COOL to room temperature; SHRED meat with fingers; RETURN to baking dish.
BAKE at 350 F until most of water is absorbed and meat is saucy, about 30 minutes.
Serve with shredded lettuce, sour cream and warmed tortillas.
Instead of using a baking dish, steps 5 and 6 may be done in a crock pot. When meat is tender, shred as directed. Step 8 may be done on stove top if necessary to cook down sauce.
Per Serving (excluding unknown items): 444 Calories; 18g Fat (36.9% calories from fat); 37g Protein; 33g Carbohydrate; 4g Dietary Fiber; 90mg Cholesterol; 502mg Sodium. Exchanges: 2 Grain(Starch); 4 1/2 Lean Meat; 0 Vegetable; 0 Non-Fat Milk; 2 Fat.