Despite the brown rice, whole wheat bread, massive vegetable portions, and frequent trips to the gym, at my last check-up my doctor told me my glucose was too high, and it was time to change my diet. Sigh. She recommended the Atkins diet to me; high in protein, as much fat as you want, and very, very limited carbohydrates. Okey, doke. No more jam, honey, sugar, pasta, baguette, white flour, cookies, cake..... WINE - ack! COFFEE - double ack! (Although I simply did not find the explanation for dropping the caffeine compelling enough to do it, so I'm still having that double cappucino in the morning.)
Well, I really like sugar; always have. This was not so easy. A week in, and the holiday ads for Trader Joe's were looking like dieter's porno. Then came the holiday parties - ack again! It was time to cook up something delicious, but that Dr. Atkins would (possibly) approve; Sweet Potato Pie!
Despite their natural sweetness, the sweet potato (often erroneously referred to as the yam) is very low on the "glycemic index;" the measure of how quickly the body metabolizes the food into glucose. In addition, it is absolutely PACKED with nutrients - it's really a miracle food!
I decided to cook up a sweet potato pie, but with some major changes to the James McNair recipe I'd been using. The crust would have to be whole grain, of course. My friend Susan had been raving about the butter crust she makes using spelt flour for quite a while. Spelt is a relative of wheat, often used by people with wheat allergies. Susan recommended it because it is not as heavy tasting as whole wheat in a crust. Okay, spelt crust, 1/2 butter, 1/2 lard, check.
I'd just been reading about how good cinnamon is for your blood pressure (also an issue for me) so I decided to raise the amount of cinnamon. Now for the sweeteners; the McNair recipe calls for a cup of sugar - fuggeddaboutit! Stevia, a completely natural, calorie-free extract from the stevia leaf, is very sweet, but has a weird aftertaste, so you have to use it sparingly, and use other sweeteners to help mask the weirdness. I knew that Erythritol, a neutral tasting sugar alcohol, works well, but is 60% as sweet as sugar. Then there's Xylitol, another sugar alcohol extract, which is fairly neutral and is as sweet as sugar. The three make an excellent sweetening blend. Okay, stevia plus erythritol plus xylitol; check.
I made the pie over and over again, each time reducing the xylitol and balancing the sweeteners until I had the perfect balance. On my eighth pie, I knew I had hit the perfect balance.
Tonight I gave a little piece of pie to friends Heidi and Richard; Richard told me that the world NEEDS this pie recipe; I'd better blog it right away. So, here goes.
Sugar-Free Sweet Potato Pie
Pie Crust: Follow the recipe posted here -
http://foodierthanthou.blogspot.com/2010/09/pie-crust.html
but substitute spelt flour for the wheat flour
The recipe makes two crusts - save one for later.
1 1/4 pounds orange sweet potatoes (about 2 medium)
1/4 cup Erythritol
2 TB Xylitol
1/4 tsp of stevia powder
1 TB coconut palm sugar (optional but delicious)
1/2 tsp salt
1/4 tsp baking soda
1 tsp cinnamon
1/4 generous tsp freshly grated nutmeg
1/4 tsp ground cloves
1/4 cup (1/2 stick) unsalted butter, melted
1 tsp pure vanilla extract
2 eggs
1/2 cup milk
While the crust is resting in the refrigerator:
Preheat the oven to 400 F
Wash the Sweet Potatoes, cut out any bad blemishes, poke a few holes in them, and pop them in the oven until a fork or knife slips into them easily.
After chilling the crust for at least 15 minutes, let it come to room temperature for about 5 minutes. (Save the parchment you wrapped it in - you'll need it in a minute!) Sprinkle your pastry cloth and the dough with flour to keep the rolling pin from sticking. Roll it out until it is even and about 1-2" larger than the widest diameter of the dish. Line a 9" shallow pie dish with the dough, leaving an overlap at the top of about 1". Gently fold the excess crust down, and pinch it into place just above the top of the pan. (It will shrink as it cooks.) Crimp the edges with a fork.
Using the parchment paper you have discarded, cover the interior of the crust and fill it with dried beans, chickpeas, or pie weights. Bake until the crust is just set, 7-10 minutes. Remove the parchment and weights, prick the crust all over the bottom, and bake until the crust is almost done but not completely browned, another 5-10 minutes. The crust tends to poof up as it bakes, so carefully poke holes in the poofy spots to deflate them. Meanwhile, the sweet potatoes are baking at the same time as the crust. Remove the pie shell, reduce the oven to 375F, and let the crust cool for 15 minutes.
Meanwhile...
When the sweet potatoes are done, take them out and remove their skins. In a large bowl, using a fork, potato ricer or masher, mash the potatoes until they are pretty evenly crushed. (If they are still hot, you can add the butter now and use the heat to melt it.) Mix in the sweeteners, spices, baking soda and salt. Then add the vanilla, eggs and milk, and mix it all thoroughly.
Place the pie crust onto a baking sheet, and pour the filling into the crust. Bake until the top feels just firm to the touch and just begins to brown, about 40-50 minutes. If the crust begins to brown too much, you can cover it with strips of foil. (I find this very difficult to do; I prefer to be really careful about not pre-baking the crust too long.)
Notes from Christine: If you don't have erythritol (it's hard to find), substitute 1/3 cup of xylitol.
