In a medium mixing bowl, combine the marinade ingredients. Mix thoroughly. Add in the duck breasts and coat with the marinade.
1 tablespoon soy sauce, 1/2 teaspoon red pepper flakes, 1/4 teaspoon ground cinnamon, 1/4 teaspoon Chinese Five Spice, 1 teaspoon sesame oil, 1/2 - 3/4 teaspoon Kosher salt, 1/2 teaspoon Freshly Ground Black Pepper, 1 batch of the marinade
Add the duck fat to the preheated cast iron skillet. Use medium to medium-high heat.
3 - 4 tablespoons duck fat
Add the thyme sprigs and garlic. Cook 30 to 60 seconds.
4 - 5 sprigs fresh thyme leaves, 2 cloves garlic
Add the marinated duck breasts into the pan, skin side down. Move the garlic and thyme onto of the duck to prevent them from burning. Allow the skin side down to cook 4 to 5 minutes.Note: Adjust the flame if the pan is smoking too much. 1 1/2 pounds duck breasts
Flip the duck over to the flesh side down and cook 4 to 5 minutes.
Remove the duck from the cast iron skillet and transfer them to the smoking wok. Cover the wok with the domes lid. Allow the breasts to smoke, covered, for 5 to 6 minutes.
Remove the duck breasts and rest for 5 minutes before cutting. Serve with your favorite side dish. Enjoy!