To start, dissolve the yeast and sugar in the warm water and set aside. Allow the yeast to sit for 10 to 15 minutes.
While you wait for your yeast, mix flour with 1 tablespoon of kosher salt.
Add 1/2 cup of olive oil and the yeast mixture to the flour. Stir until the dough comes together.
If you’re using a mixer, turn the speed up to medium and continue to knead for 5 to 6 minutes. If you’re doing this recipe by hand, transfer the dough to a lightly floured surface and knead the dough until it feels soft and smooth.
Use your hands to shape the dough into a round ball.
Coat the inside of your bowl or mixer with 1 teaspoon of olive oil.
Put your dough ball back into the bowl, and flip the dough once so both sides have an even coating of olive oil. Cover and let your dough rise until it doubles in size.
Coat a 12-inch by 16-inch baking sheet with 1/4 cup olive oil.
Place the dough on the pan and start to stretch it until it reaches the edges of the pan. As you work the dough, flip it over a few times to ensure each side gets a thorough coating of olive oil.
Spread your fingers wide and press into the dough, creating a dimpled surface.
Cover and let rise until it doubles in size again, about 1 to 2 hours.
Preheat your oven to 425° Fahrenheit (218° Celsius), and set the rack to the middle position.
Lightly drizzle 1-2 teaspoons of olive oil over the focaccia. Then, sprinkle the rosemary and remaining 3/4 teaspoon kosher salt over the bread.
Bake for 20 minutes until golden brown.
Allow the bread to cool in the pan over a wire rack for 15 minutes. Turn onto a cutting board and cut into squares.
Notes
If you don't have fresh rosemary, you can substitute with 1 Teaspoon Dried Rosemary