This recipe is from the sweet potato episode of Good Eats with Alton Brown, I could not find it here, so I added it.
I used 100% pure grade A dark maple syrup, it was so tasty. When I made this recipe I did not weigh out my potato and had ebough to make another pie, so my second one didn't get topped with pecans or syrup, and was still amazing! I also did not add any salt. We had health nerds over for Thanksgiving, so it all worked out. So now you know you can double your potatoes and still have a delicious pie.
Prep time includes the time it takes to steam the sweet potatoes. Does NOT include cooling time (which is about an hour as stated below.)