Goan Pork Vindaloo

Name: Goan Pork Vindaloo
Ingredients: 3/4 cup water; 1 (2-inch) piece ginger , peeled and sliced crosswise ⅛ inch thick; 6 garlic cloves; 3 tablespoons Kashmiri chile powder; 1 tablespoon paprika; 1 tablespoon ground cumin; 2 teaspoons table salt; 1 teaspoon pepper; 1/4 - 1/2 teaspoon cayenne pepper (optional); 1/2 teaspoon ground cinnamon; 1/2 teaspoon ground cardamom; 1/4 teaspoon ground cloves; 1/4 teaspoon ground nutmeg; 1 (3-3½ pound) boneless pork butt roast , trimmed and cut into 1-inch pieces; 1 tablespoon vegetable oil; 1 large onion , chopped fine; 1/3 cup coconut vinegar