In a large bowl, whisk together 1 cup (120g / 4.2 oz) of the bread flour, the whole wheat flour, cornmeal, flaxseed meal, yeast, and salt. 2.
Pour in the warm water and stir with a wooden spoon until a shaggy dough begins to form. 3.
Turn the dough out onto a lightly floured surface.
Knead for 3 to 5 minutes, gradually adding the remaining 1/4 to 1/2 cup (480 ml) of bread flour until the dough is moderately soft, smooth, and elastic. 4.
Shape the dough into a ball and place it in a lightly greased bowl, turning it over once to coat the entire surface with oil. 5.
Cover the bowl with a clean kitchen towel or plastic wrap and let it rise in a warm, draft-free place for 2 1/2 to 3 hours, or until it has doubled in size. 6. Gently punch the dough down to release the air.
Turn it out onto a lightly floured surface and divide it in half. 7.
Cover the two dough halves and let them rest for 10 minutes before shaping and adding your favorite toppings.
Add the final portion of bread flour gradually while kneading. The dough should be soft and slightly tacky, not dry and stiff.