Sausage Cheese And Blackbean Empanada Filling

Name: Sausage, Cheese And Blackbean Empanada Filling
Ingredients: 1 large onion, chopped; 2 tablespoons vegetable oil; 2 teaspoon cumin; 2 teaspoon chili powder; 1 tsp salt; 1 tsp garlic powder; 1/2 tsp cayenne powder; 2 small tomatoes from a can, diced; 4 Mexican chorizo sausages; 1 tablespoons sugar; 1 15-ounce can black beans, rinsed and drained; 1/3 cup raisins (optional); 4 ounces monterey jack cheese, shredded; Salt and pepper to taste; 1 egg yolk