Mix yeast and warm water (85 degrees).
Add half of the flour. Mix with wooded spoon until creamy.
Add remaining flour. Knead in mixer for two minutes on low or until fully incorporated.
Add salt. Mix another minute, making sure all salt is incorporated.
Add olive oil until completely absorbed.
Cover, rest 10 minutes.
Stretch and fold. Rest for one hour.
Stretch and fold. Rest for another hour.
Cover with plastic wrap and refrigerate overnight, 12-18 hours.
Remove from refrigerator. Place dough on baking sheet.
Focaccia should be more than doubled by this time.
Oil a large baking sheet (13 x 9.5) with olive oil.
Cover for one hour. Set the oven 500 degrees on bake mode.
After one hour, stretch dough out to fit the pan.
Pour water and olive oil mixture over the focaccia (about 1/4 cup).
Use finger tips to make the focaccia holes all over.
Sprinkle with flaked sea salt.
Reduce heat to 480 degrees F. Bake for 20 minutes or until golden brown. After ten minutes turn around in oven for more even baking.
Focaccia makes great sandwiches. Cool. Cut into squares and use bread knife to cut crosswise.