In a large mixing bowl whisk together flours and yeast.
In a large liquid measuring cup whisk together water, juice, maple syrup, zest and vanilla.
Add wet to dry and use a fork to mix everything together and then use your hand to bring dough together. This dough will be wet and sticky. If dough seems too dry add more water a tablespoon at a time until soft and sticky.
Cover bowl with plastic film or a tea towel and let sit for 12-18 hours. Dough should double in size and be covered in air bubbles.