Found this on alt.food.vegan where it is an adaptation Peter Berleys' 'Lemon Tart with Toasted Almond Crust' from his book, 'The Modern Vegetarian Kitchen'. I haven't tried it but it has excellent reports from the newsgroup.
Preheat to 350°F Lightly grease a 9" tart pan.
Mix the ingredients together and press into the bottom of the dish.
(It is a dryish mix so you can add more oil although it is not necessary).
If you're using a proper metal tart pan, press the dough up the fluted sides.
Prick the bottom a few times with a.
fork.
Bake for approx 20 min, until brown.
Let cool before adding filling.
Dissolve arrowroot in 1/2 cup of water and set aside.
Filling: Mix coconut milk, 1 cup of the water, sugar, agar& turmeric into a saucepan.
Simmer until agar dissolves (usually takes between 6-8 minutes for flakes, a. little less time for powder--don't over cook or agar will lose its strength).
Stir in the lemon juice, zest& vanilla then bring to a boil.
Add the arrowroot/water mixture and boil for one minute.
[It's important to stir throughout as you don't want the agar to clump up along the bottom of the pan.
You'll feel it thickening up when you add the arrowroot.
mix.
].
Pour into the cooled crust and let firm up before serving.
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