Step 1Cook pork in 3 cups water with salt over medium heat about 30 minutes. Remove excess liquid.
Step 2Heat skillet until very hot. Add butter. When butter melts, add tomatoes, tomatillos and garlic and fry 2 minutes. Then add 2 cups water, cloves and peppercorns and cook 5 minutes. Remove from heat and blend in blender with green onions, bell pepper and parsley. Add more water or broth if needed for blending.
Step 3Add this mixture to pork and cook 5 minutes. Add some of masa liquid to sauce and cook 5 minutes more. Sauce should be medium thickness. Taste and adjust seasoning.