Creating delicious Onion Focaccia is a rewarding experience that can be easily mastered with these step-by-step instructions:

1. Activate Yeast: In a small bowl, mix warm water, sugar, and yeast. Let it sit for about 10 minutes until it becomes frothy.
2. Prepare Dough: In a large mixing bowl, combine flour and salt. Create a well in the center and pour in the yeast mixture along with ⅓ cup of olive oil.
3. Mix Together: Using a wooden spoon or your hands, mix until a shaggy dough forms.
4. Knead the Dough: Turn the dough onto a floured surface and knead for about 5-7 minutes until it’s smooth and elastic.
5. First Rise: Place the dough in a lightly greased bowl, cover with a kitchen towel, and let it rise in a warm area for 1 to 1.5 hours or until doubled in size.
6. Prepare Onions: While the dough rises, heat a tablespoon of olive oil in a skillet over medium heat. Add the sliced onions and sauté until they are soft and caramelized, about 15 minutes. Add chopped rosemary, salt, and set aside to cool.
7. Shape Focaccia: After the dough has risen, gently punch it down and transfer it to a greased baking sheet. Press it out to fit the shape of the pan.
8. Create Dents: Use your fingers to make dimples all over the dough. Drizzle with additional olive oil and sprinkle with sea salt.
9. Top with Onions: Spread the caramelized onions evenly over the surface of the dough, gently pressing them into the dimples.
10. Second Rise: Cover the dough again and let it rise for an additional 30 minutes.
11. Preheat Oven: Preheat your oven to 425°F (220°C) during the second rise.
12. Bake: Bake the focaccia for 25-30 minutes or until golden brown.
13. Cool and Slice: Allow it to cool in the pan for a few minutes before transferring to a wire rack. Once slightly cooled, slice and serve.

These simple steps will guide you in creating a stunning Onion Focaccia that is guaranteed to please!