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1
Combine bread flour, water, and instant yeast in the bowl of a stand mixer fitted with a dough hook; mix on low speed for 3 minutes until a shaggy dough forms, then rest 10 minutes (autolyse).
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2
Add sea salt and 60 ml olive oil; mix on medium speed for 8–10 minutes until dough is smooth, elastic, and slightly sticky (perform the windowpane test: stretch a small piece gently until translucent).
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3
Transfer dough to a lightly oiled bowl, cover loosely with plastic wrap, and proof at room temperature (20–22°C) for 2 hours until doubled in volume (bulk fermentation).
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4
Gently pour remaining 20 ml olive oil into a 25 cm round baking tin (or 25 × 35 cm rectangular), coating the surface evenly; transfer proofed dough into the tin and gently stretch it to fill, creating an even layer (do not tear).
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5
Cover with plastic wrap and let rest for 30 minutes at room temperature (final proof) until the dough rises slightly and feels airy to the touch.
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6
Preheat oven to 220°C; using your fingertips, dimple the entire surface of focaccia by pressing firmly into the dough to create characteristic indentations (1 cm deep), working across the surface evenly.
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7
Scatter coarse sea salt and rosemary sprigs over the dimpled surface; drizzle with a small amount of olive oil.
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8
Bake for 20–25 minutes until golden-brown and tapping the base produces a hollow sound; cool on a wire rack for 5 minutes, then transfer to a cutting board and slice while still warm.