In a large pot of boiling water, add the turkey, onion, garlic, parsley, cilantro, celery, and bay leaves. Cook for 30–40 minutes, or until the turkey is fully cooked through and tender.
Once done, remove the turkey from the pot, shred it, and set it aside. Keep the cooking broth in the pot.
To the same broth, add the green bell pepper, tomatoes, and dried chiles. Simmer until everything is soft and cooked through—about 10–15 minutes.
Carefully transfer the cooked vegetables and broth to a blender. Add the seeds and seasonings, and blend until completely smooth.
In the same pot, heat 1 tablespoon of oil over medium heat. Pour in the blended sauce, then stir in the shredded turkey, Worcestershire sauce, tomato paste, salt, and pepper. Simmer for 30 minutes, stirring occasionally.
To assemble the sandwiches, slice the bolillos in half lengthwise and spread a thin layer of mayonnaise on each side.
Add lettuce, watercress, tomato slices, cucumber, and radish. Top with shredded turkey and spoon over a generous amount of the savory sauce.
Serve warm and enjoy!