Shark Empanada Filling

Name: Shark Empanada Filling
Ingredients: 1 sprig rosemary; 1 sprig fresh thyme; 2 bay leaves; 1 lb. skinless shark (or swordfish) steaks; 1 ⁄ 2 tsp. salt; 1 white onion, peeled and diced; 2 tbsp. olive oil; 6 cloves garlic, peeled and chopped; 9 plum tomatoes, peeled, seeded, and chopped; 8 pitted green olives (such as manzanillas), chopped; 1 tbsp. chopped capers; 1 fresh serrano chile, stemmed and chopped; 2 tbsp. currants; 1 tbsp. pickled jalapeño juice; 2 tbsp. chopped fresh parsley; Salt and freshly ground black pepper