Stuffed pork stomach sliced and served in tacos is a rustic Mexican delicacy. This high protein, carnivore dish is a fresh, bold option for adventurous family taco nights.
Thoroughly clean the pork stomach in cool running water, scrubbing with salt and vinegar until the odor dissipates; rinse multiple times.
Prepare the stuffing: finely dice pork shoulder, mix with chorizo, minced garlic, oregano, cumin, half the salt and pepper, and combine well.
Gently stuff the pork stomach with the meat mixture, packing tightly but not overfilling to avoid bursting during cooking. Secure the opening with kitchen twine or skewers.
Place the stuffed stomach in a large pot of simmering salted water with apple cider vinegar. Simmer gently on low heat (barely bubbling) for 2.5–3 hours, turning occasionally for even cooking.
Remove the stomach; let it rest for 15 minutes. Slice into 1/2-inch pieces, then pan-sear the slices on medium-high heat for 2–3 minutes per side until lightly crisped.
Warm corn tortillas; assemble with sliced obispo, finely chopped onion, and cilantro. Serve immediately while hot.