Season the pork generously with salt and pepper. Add the garlic, chile powder and cumin, and mix well, massaging the seasoning into the meat with fingers. Let the meat marinate for at least an hour, or refrigerate overnight.

Heat the oil in a wide cast iron skillet over medium heat. When the oil looks wavy, add the meat and let it sizzle, stirring occasionally, until lightly browned and cooked through, 5 to 7 minutes. Turn off the heat and keep meat warm.

Heat the tortillas on an ungreased hot griddle or cast iron pan. Turn them once or twice until hot and slightly puffed. As they come off the griddle, stack them on a cloth napkin to steam, with another napkin on top.

Place tomatillos, onion, garlic, and chile pepper into a saucepan. Season with cilantro, oregano, cumin, and salt; pour in water. Bring to a boil over high heat, then reduce heat to medium-low, and simmer until the tomatillos are soft, 10 to 15 minutes.

Using a blender, carefully puree the tomatillos and water in batches until smooth.

Drain tomatoes in a strainer for 15 minutes.

Combine tomatoes, onion, jalapeno pepper, serrano pepper, and garlic in a large bowl. Pour lime juice over the top. Stir in oregano, cayenne pepper, salt, sugar, mint, and cilantro. Refrigerate for 1 hour. Season with salt to taste.