Mix sourdough starter into water.
Add both the flours and salt.
Knead it for 10 minutes till the dough becomes soft and smooth.
Proof it for 2 to 3 hours till it gets double in volume.
Divide the dough into 5 or 6 parts. Make roundels, brush milk on these, Cover with a napkin and proof for 15 minutes again.
Start preheating oven along with the baking tray at the highest degree in your oven, using both the rods.
Transfer one roundel to the parchment paper and spread it out to a circle. Prick with a fork all over.
Put this base along with the parchment paper to the preheated baking tray.
Keep it in the middle rack and bake for 10 minutes till the base becomes sturdy and the dough no longer looks raw.
Take it out and cool it on a wire rack.
Similarly, make all other pizza base.