Fried Beef Empanadas with Olives and Sofrito

Name: Fried Beef Empanadas with Olives and Sofrito
Ingredients: 1 pound lean ground beef; 2 medium onions, finely chopped; 1 cup diced bell pepper; 4 cloves garlic, minced; 1 cup seeded, finely chopped tomatoes; 0.25 cup sofrito (such as Goya®); 2 tablespoons chopped raisins; 1 cup chicken stock; 0.5 cup tomato sauce; 0.5 cup chopped fresh cilantro; 0.25 cup chopped Spanish olives; 2 (1.41 ounce) packages sazon seasoning (such as Goya®); 1 teaspoon dried oregano; 0.5 teaspoon ground cumin; salt and ground black pepper to taste; 1 large egg, beaten; 1 tablespoon water; 2 (14 ounce) packages frozen empanada shells (such as Goya® discos), thawed; 1 cup oil for frying, or as needed