Prepare the Dough: In a large mixing bowl, combine the active sourdough starter and warm water. Mix until the starter is fully dissolved.
Add Dry Ingredients: Add the flour and sea salt to the mixture. Stir with a wooden spoon or dough scraper until a shaggy dough forms.
Knead the Dough: Turn the dough out onto a lightly floured surface and knead for about 5-7 minutes until smooth and elastic.
First Rise: Place the dough in a clean, lightly oiled bowl and cover with a clean kitchen towel. Let it rise in a warm place for 4-6 hours, or until it has doubled in size.
Prepare the Pan: Line a baking sheet or focaccia pan with parchment paper and drizzle with olive oil.
Shape the Dough: Turn the risen dough out onto the prepared pan. Using your fingers, gently press the dough out to fit the pan. Create dimples in the dough with your fingertips.
Second Rise: Cover the dough with a clean kitchen towel and let it rise for an additional 2 hours.
Preheat the Oven: Preheat your oven to 425°F (220°C).
Add Toppings: Drizzle the dough generously with olive oil and sprinkle with fresh herbs and flaky sea salt.
Bake the Focaccia: Bake in the preheated oven for 20-25 minutes, or until golden brown and crispy on the edges.
Cool and Serve: Allow the focaccia to cool slightly in the pan before transferring to a wire rack to cool completely. Slice and serve warm or at room temperature.