To make the yeast mixture, combine 100 g warm water, the sugar and yeast in a small bowl. Set aside in a warm spot for 10–20 minutes. The top of the mixture should be slightly domed and very bubbly. If this doesn’t happen, discard the mixture and start again (as yeast is inactive).
Meanwhile, combine flours, salt, ginger powder (if using) and psyllium in a large non-reactive bowl. Add the bloomed yeast, olive oil and 300 g warm water and use a spoon to stir thoroughly until no lumps remain. The dough should look a bit like thick porridge. Cover and set aside to rise in a warm, non-draughty place for 1 hour or until doubled in size.
Preheat oven to 200°C. Line 2 baking trays with baking paper.
Divide dough into 2 or 4 portions. Using thoroughly oiled hands, place one piece of dough on a prepared tray and use your hands to press it out into a circular pizza shape, about 20 cm in diameter for small pizzas or 30 cm for large. You can make the pizza thinner or thicker depending on how you like it but remember that this will affect cooking time. I like to leave
the edges a little thicker than the body of the pizza to mimic a traditional pizza crust. Repeat with remaining dough.
Bake pizzas one at a time for 15–20 minutes, thickness dependent. I like to put a small baking dish of boiling water in base of oven to give dough a bit of lift (the steam will help the dough puff up (but this is optional).
Remove from oven – pizza is now ready to top with your favourite toppings.