Slow Cooker Guisado Verde

Name: Slow Cooker Guisado Verde
Ingredients: 2 tablespoons vegetable oil; 2 pounds boneless pork shoulder; 1 large onion, coarsely chopped; 3 cloves garlic, chopped; 2 (12 ounce) cans tomatillos, drained and chopped; 1 (7 ounce) can diced green chile peppers; 2 fresh jalapeno peppers, sliced; 0.5 cup fresh chopped cilantro; 1 teaspoon dried oregano; salt and pepper to taste; 1 quart water; 1 cup shredded Monterey Jack cheese; 0.25 cup sour cream; 4 sprigs fresh cilantro, for garnish