A citrusy, garlicky tomatillo sauce infuses pork tenderloin with bold flavor. You can also skip the pork and use the sauce as a salsa.
Preheat oven to 450 degrees. Place pork on a rimmed baking sheet; rub with cumin, and season with salt and pepper. Roast, turning once, until an instant-read thermometer inserted in the thickest part of pork registers 145 degrees, 20 to 25 minutes. Let cool for 10 minutes; cut into 4 chunks. Using two forks, shred pork; transfer to a medium bowl and set aside.
In a large saucepan, heat oil over medium; add onion and garlic. Cook, stirring occasionally, until onion begins to soften, 4 to 6 minutes. Add tomatillos and 3/4 cup water. Bring to a boil, and reduce to a simmer; cook until tomatillos are soft, 5 to 7 minutes.
Transfer to a food processor, and blend until smooth; season sauce with salt and pepper. Add 1 cup sauce and corn to pork; mix to combine. Transfer remaining sauce to a shallow bowl.
Wrap stacked tortillas in damp paper towels; microwave on high for 1 minute to soften. Working with one tortilla at a time, dip in sauce, place on a work surface, and fill with 1/4 cup pork mixture and 1 tablespoon cheese. Roll up, and arrange, seam side down, in a 13-by-9-inch baking dish. Top with remaining sauce and cheese; cover dish with aluminum foil.
Bake until sauce is bubbling, 15 to 20 minutes. Remove foil, and continue to bake until cheese is browned, about 15 minutes. Let enchiladas cool in dish for 10 minutes, and serve.