Cut pork into 1 inch cubes; season with salt and pepper.
Heat oil in a large skillet or Dutch oven. Add pork, onions, garlic powder, chili powder, and chipotle chile powder; sauté until browned, 3 to 5 minutes.
Add enough water to barely cover pork; bring to a boil. Cover, reduce heat, and simmer 30 minutes. Remove the lid and continue to simmer until liquid has evaporated, about 45 minutes.
Combine chopped tomatillos, tomatoes, and cilantro in a small bowl.
Place an equal amount of pork on each tortilla. Top with tomatillo salsa.
Pork Carnitas with Cilantro Tomatillo Sauce · Dinner Match Lab | Dinner Match Lab