While the meat is searing, in a separate medium pot, combine the dried chiles, halved white onion, garlic cloves, tomatoes, spices, and bay leaves. Cover everything with cold water and place the pot over medium heat. Allow the mixture to gently simmer for approximately 15 minutes. Once done, carefully pour the contents through a strainer, ensuring you capture all the flavorful liquid. Transfer everything, including the whole spices, to a blender. If your blender is on the smaller side, you may need to work in batches to ensure everything blends smoothly.