Mix all the biga ingredients together in a bowl to from a ball of dough. Using wet hands to knead for 2 minutes until all the ingredients are fully hydrated.
The dough should feel very tacky. Let the dough rest for 5 minutes and then knead it again for 1 minute. The dough will come smoother but still tacky.
Transfer the dough in a clean bowl, cover it tightly with plastic wrap and put into the fridge for 8 hours up to 3 days.
About 2 hours before you mixing the final dough remove the biga from the fridge.
Cut the soaker and the biga into 12 smaller pieces. DIssolve the yeast in the water in a bowl, add the pre-dough pieces and the salt and knead with wet hands for 3-4 minutes until the ingredients comes together as a dough.
Add the 7 tbsp of whole wahte flour and continue knead the dough for 2 more minutes. The dough should be frim and not sticky. If not add more flour or water as needed.
Dust the work surface with flour and roll the dough in the flur to coat. Knead the dough by hand for 3-4 minutes, incorporating only as much extra flour as needed to form a stiff dough. Let it rest for 5 minutes while your prepare a clean ligthly oiled bowl.
Resume kneading the dough for 1 minute to strengthen the gluten and make a final four and water adjustment. Put the dough in the oiled bowl. Cover loosely with plastic wrap and let rise at room temperature for 45 to 60 minutes.