Cook Chicken In 3 Cups Water With Salt For 30 Minutes. Cook Tomatoes, Tomatillos, Both Chiles In 1 Cup Water For 10 Minutes. Toast Sesame And Squash Seeds, Cinnamon Stick And Hot Chile Flakes In A Dry Skillet Over Low Heat For About 10 Minutes. Careful Not To Burn Them. Process Toasted Ingredients To A Powder, Then Add To Tomato Mixture. Process This Mixture To A Smooth Paste. Add Bread, Achiote, 2 Cups Chicken Broth And Flour. Process This To A Smooth Paste. Add This Sauce To The Chicken. Simmer Over Low Heat For 15 Minutes Or Until Sauce Is A Thick Red Paste. Serve With Tortillas Or Rice.