Best Filipino Empanada

Name: Best Filipino Empanada
Ingredients: 4 tablespoons vegetarian oyster sauce; 1 tablespoon black rice vinegar; 2 teaspoons chilli sauce; 3 tablespoons vegetable oil; 2 oz onion (thinly sliced); 4 oz shiitake mushrooms (finely chopped); 3 oz carrot (grated); 2 cloves garlic (minced); 3 oz potatoes (diced); 2 oz cabbage (shredded); ½ cup water; salt and pepper to taste; 2 eggs (large); ⅓ cup ice water; 1 tablespoon distilled white vinegar; 3 cups unbleached all-purpose flour; 1 ¼ teaspoons salt; ¾ cups cold unsalted butter (cut into cubes)