Preheat your oven to 350℉ degrees. Line a 9 x 9-inch baking pan with parchment paper.
In a large bowl, whisk together the almond flour, flaxseeds, maple syrup, 3 tablespoons water, and salt. If needed, slowly drizzle in a little bit of additional water while stirring, just until the mixture comes together in a thick, cohesive dough. It should be about the consistency of wet clay.
Transfer to your prepared baking dish and use your spatula or lightly moistened hands to press it out into an even layer. Bake for 22 - 25 minutes, until golden around the edges.
Meanwhile, in your blender or food processor, combine the tofu, lemon zest and juice, maple syrup, cornstarch or potato starch, agar, turmeric, and salt. Blend until completely smooth, pausing to scrape down the sides of the canister as needed.
Pour the mixture into a medium saucepan over medium heat. Whisk continuously until thickened and bubbling gently; 5 – 8 minutes. Immediately turn off the head and stir in the vanilla.
Pour the filling over the baked crust, smoothing it into an even layer with your spatula. Let stand until cooled to room temperature, then refrigerate for 2 – 3 hours, until thoroughly chilled. Slice into squares and enjoy!