Initially, she read somewhere that sweet potatoes needed to cure in a cool space. More recently, we've read that it's a good idea to leave them for a few weeks in a warm, humid environment then store later in a climate similar to a root cellar.
Conversely, we've had our sweet potatoes in a tower stack in our garage where temperatures have been down as low as 10 F over the last few weeks.
The jury is still somewhat out (could they have picked up more flavor and sweetness in a warmer climate?), but they tasted pretty good and were reasonably sweet.
We had been concerned that by harvesting them late, curing in a cool garage, then storing in a cold garage that they'd be leathery, starchy, and inedible. They are definitely edible!
The recipe:
Skin 1-2 sweet potatoes. Cut up the sweet potatoes into typical french fry size.
Lightly toss with some light olive oil.
Put them on a baking sheet and gently sprinkle with sea salt.
Bake at 425 degrees (no fan) until the fries start getting lightly browned. Don't let them char or they get inedible!