Heat 2 tablespoons oil in large pan over medium-high to high heat. Add shrimp and sear 2 minutes, then turn, season with salt and pepper, and cook a minute more, and remove from pan. Add another turn of oil and the ginger and garlic, stir a minute, then add sherry, reduce by half, add stock and let it bubble. Reduce for a minute, then add soy sauce and Sriracha and swirl, then add shrimp back to pan and turn to coat. Cook shrimp through 2 minutes more and douse with juice of 1 lime, drizzle with sesame oil and toss. Transfer to platter and top with cilantro, chives and sesame seeds to serve.