Grind the Einkorn berries on a fine setting on your grain mill.
In a large bowl, add the water, olive oil, and salt.
Pour the flour over this mixture and add the yeast on top.
If using active dry yeast, take 1/4 cup of the warm water and sprinkle the yeast on top. Cover and let bloom and become frothy for 5-10 minutes.
Mix the dough with a stiff spatula or danish dough whisk until no dry flour remains.
Cover with plastic wrap and let rest for 30 minutes.
Next, perform 3 sets of folds with 15 minutes in between.
To do a fold, turn the dough onto a floured work surface and pull each corner of the dough over the center of the dough all the way around.
Return the dough back into the bowl after each fold.
After the last fold, cover and let the dough rise an additional 1-1 1/2 hours or until noticeably bubbly and risen.
Pro tip: Since this is a high hydration dough, a bowl of water on the counter to dip your fingers in while working with the dough is super helpful!
Grease a 12 inch cast iron skillet.
Turn the risen dough into the skillet and drizzle with a tablespoon of olive oil.
Using the tips of your fingers, dimple the dough and spread it evenly out into the pan.
Cover with plastic wrap and let rise for 30 minutes.
Preheat the oven to 400 degrees F.
Add your choice of toppings and bake the focaccia in the preheated oven for 20-25 minutes until lightly golden brown.
Allow to cool on a wire rack completely before storing.