Same Day Focaccia Bread — Samantha Chen Bakes

Ingredients

• 4 cups (512 g) all-purpose flour or bread flour
• 2 teaspoons (10 g) salt
• 1.5 teaspoons instant yeast
• 420 mL water lukewarm water
• 4 tablespoons olive oil, divided and for greasing
• flaky sea salt, such as Maldon
• 1 to 2 teaspoons whole rosemary leaves for topping, optional