In a large mixing bowl combine the flour, salt and half of the rosemary. Add the mashed potato and using your hand work it into the flour mix.
2.5 cups all purpose flour, 1 tsp fine sea salt, 1/2 cup mashed potato, 1-2 sprigs fresh rosemary
In a separate bowl whisk the warm water with the yeast and olive oil. Pour over the flour mixture. Use a large spatula to mix the dry and wet ingredients until everything is combined and a sticky dough forms. Use your hand to knead for just a minute until the dough comes together into a ball.
1 cup warm water, 1.5 tsp instant yeast, 3 tbsp extra virgin olive oil
Brush or drizzle the top of the dough with a little olive oil then cover the bowl with a lid, plastic wrap or a kitchen towel. Place in a draft free area and allow to rise for 2-3 hours or until doubled in size.
Lightly oil a 12 inch cast iron skillet then dump the focaccia dough inside. Use your hand to spread the dough inside the skillet all the way to the sides.
Using the tip of your fingers to press all over the top to create dimples.
Lightly drizzle with some olive oil then add your favorite toppings: olives, heirloom tomatoes and rosemary, pepperoncini, red onion, scallions, zucchini etc
2-3 tbsp black olives, heirloom or cherry tomatoes, 1-2 sprigs fresh rosemary, 1 pinch Fleur de Sel sea salt
Finish with a sprinkling of Fleur the Sel (sea salt flakes) and cover with a lid. Allow the focaccia to rise again at room temperature for 30 to 45 minutes or so while the oven is heating up.