Combine the water, yeast and sugar in a small bowl. Stir to dissolve and allow to sit for 10 minutes.
While the yeast activates in the water, fit the stand mixer with the dough hook. Combine 00 flour, all purpose flour, whole grain flour and salt and set the stand mixer on medium-low speed to combine.
With stand mixer on low, drizzle in water-yeast mixture. Mix until the dough starts to form, 3 minutes. Tap the sides of the bowl a few times to shake the flour loose from the sides.
Once the dough has come together, increase the stand mixer to medium speed and knead for 10 minutes. If the dough is looking too wet and sticking to the dough hook too much, add more flour. If it seems too dry, add a touch more water.
Transfer the dough to a well oiled bowl or large food safe container. Drizzle in a good glug of olive oil and knead by hand to combine. Cover the bowl/container with a lid or kitchen towl and allow to rise until doubled, 1 1/2 hours.
After the first rise, gently deflate the dough by folding it into thirds. Turn the bowl and repeat this process 2-3 times. Cover and allow the dough to rise 1 hour more.
After the 1 hour rise, deflate the dough using the same technique, cover again and let rise another hour. At this point, the dough can be used right away or stored in the fridge for up to 2 days.
To make a pizza: flour the counter well with semolina flour. Cut the dough into 2 or 3 pieces and roll/stretch it out on the semolina flour. Top with pizza toppings of choice and bake.