pour any bacon grease into a mason jar after i cook bacon so i usually have it on hand.
the bacon grease should be soft, so just toss the spices and grease on the potatoes then stir with a wooden spoon. keep mixing until the fries are evenly coated.
one final note for success: spread the fries out in a single layer on the lined baking sheet. a single layer is key for quick, even cooking. i usually have two pans of these when i make them, and i find them cook just fine using both the top and bottom rack of them oven.
hands down, my favorite way to eat sweet potatoes 