For the pastry:
1 1/4 cup sorghum flour
1/2 cup arrowroot flour
1/4 cup quinoa flour
1 teaspoon xanthan gum
1 teaspoon sea salt
1 teaspoon Italian seasoning
4 tablespoons extra-virgin olive oil
1/2 cup cold water

For the ricotta:
1 (350 g) package firm tofu, squeezed of excess moisture
Juice from half a lemon
4 tablespoons nutritional yeast
1 tablespoon Italian seasoning
1/2 teaspoon garlic powder
Fine sea or Himalayan salt to taste
Freshly ground pepper to taste

For the topping:
3 to 5 tomatoes, thinly sliced
1/2 red onion, thinly sliced
1 tablespoon extra-virgin olive oil
1 teaspoon agave nectar
Fine sea or Himalayan salt to taste
Freshly ground pepper to taste
1 handful fresh basil, thinly sliced

Preheat the oven to 375 degrees F. Lightly oil a 10-inch tart pan with a removable bottom and set aside. To begin with the crust, whisk together the sorghum flour, arrowroot flour, quinoa flour, xanthan gum, salt and Italian seasoning. Add the olive oil and stir to blend. Slowly add the cold water, mixing in just enough to create a soft dough.

Transfer dough to a floured work surface and knead about three times for it to come together. Do not overwork the dough — it will become tough. Roll dough into a circle two to three inches larger than your tart pan. Carefully fold the dough over your rolling pin and place it in the centre of your pan then use your fingers to gently press the dough into the crevasses and up the sides of your pan. Trim the edges and patch if necessary. Set aside.

For the filling, place the tofu, lemon juice, nutritional yeast, Italian seasoning and garlic in the food processor, and pulse until crumbled. Season with salt and pepper to taste, and adjust seasonings if desired. Spread tofu filling into prepared tart pan, filling it about 2/3 of the way from the top. Depending on the size of your pan, you may have some left over.

Starting from the outer edges, lay the tomatoes on the ricotta filling, overlapping as you work your way around, until the top is covered. Tuck in the red onions randomly. In a small container, mix together the olive oil and agave nectar, and brush tomatoes with the mixture. Season with salt and pepper.

Bake for 30 to 40 minutes until the crust is browned and the tomatoes and onions are cooked through. Remove from oven and sprinkle with fresh basil. Serve at room temperature.