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Preheat oven to 325 degrees F.
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In a small bowl, combine warm water with flaxseed meal and set aside for at least 10 minutes until it thickens.
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Cream together butter and coconut sugar until well combined.
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Add flaxseed mixture, salt, vanilla, lemon zest, and lemon juice to the butter mixture. Mix until well combined.
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In a separate medium sized bowl, mix together flour, xanthum gum, and baking powder.
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Slowly pour the flour mixture into the butter mixture, until all the flour is well incorporated.
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Cover mixing bowl and chill for at least 30 minutes.
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In a 9-inch tart pan, evenly distribute batter along the bottom and edge of tart pan.
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Bake for 30 minutes or until tart shell is cooked through. Let cool completely.
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While baking the tart shell, start prepping your filling.
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In a high speed blender, place all filling ingredients, and blend until smooth.
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Pour filling into cooled tart shell.
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Place tart in freezer for 3 - 4 hours until firm.