Vinegar Pie

Happy Pi Day!

This recipe hit my radar when I was reading up on pies that people make for Pi Day (March 14). I really didn't know what I wanted to make; but I did know I wanted to make something I hadn't made before. This recipe originates from the mid-19th century and counts as a pioneer style of baking (think Little House on the Prairie). The recipe ratio comes from Michigan's MLive article on the same topic.
Unbaked pie crust, filled pie crust, baked pie, finished pie with cinnamon dusting

Ingredients

1 pre-baked coconut flour pie crust

2 large eggs
1 c organic granulated sugar, divided
1 tbsp tapioca starch
1 c cold filtered water
2 tbsp apple cider vinegar
ground cinnamon, for dusting
organic whipped cream, optional

Directions

Preheat oven to 350 degrees F.

1. Whisk together eggs and 1/4 c sugar in a bowl.

2. Attach a candy thermometer to the pot. In a heavy pot, sift together tapioca starch and 3/4 c sugar. Add cold water and vinegar. Whisk together and bring boil until the sugar dissolves. While whisking, add egg mixture in a slow stream. Cook over medium heat until the custard registers 175 degrees F on the cooking thermometer.

3. Remove from heat and pour into pie shell. Cover rim with a pie shield or aluminum foil. The hot pie plate was too much for me and I just let the crust get really dark without either method in play. Bake until the pie filling is set, 15-20 minutes.

4. Let cool completely on a rack. Dust evenly with ground cinnamon.

In this case, mine was still wobbly after cooling on a rack; so I let it chill in the refrigerator and then dusted it with ground cinnamon.

[Update: This one of the worst recipes I have ever made. It's too sweet. The filling is like a runny not-quite-soury meringue that sat out for too long on a hot day. This pie ranks up there with tuna casserole. Don't make it. Well, if you do, don't overbake the coconut crust because that thing gets rock hard!]