Mix together the ground flax seed and water and let sit for 5 minutes - it will thicken up to a gel-like texture.
Combine the flax seed mixture with the almond flour, vanilla extract, and salt.
Press the dough into a tart pan. Poke some holes in the bottom of the crust using a fork.
Bake at 425 degrees for 20-25 minutes, or until the crust is golden brown.
Vanilla Cream Filling
In a small bowl, whisk together the agar powder, cornstarch, and almond milk.
Add the coconut cream, sugar, and agar/cornstarch mixture into a pot. Whisk thoroughly.
On medium heat, bring to a boil and then remove immediately from the stove. It should be nice and thick at this point. Whisk in the vanilla extract and lemon juice.
Transfer the mixture to a blender or use an immersion blender. Be SUPER careful while blending, because you definitely don't want the hot liquid to splatter everywhere. Blend for one minute. This will create a lighter texture.
Pour the filling into the tart crust. Set it in the fridge until the filling is firm (1-2 hours.)
For the topping, mix strawberries with a little sweetener (like agave or maple syrup.) Place the strawberries right on top of the tart when it's set.
Best served the day of, but still tasty the day after.