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1
Position a rack in the center of the oven and preheat to 400u00b0F. Lightly coat a 9 by 13-inch metal baking dish with 2 tablespoons of the oil.
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2
In the bowl of a stand mixer fitted with the hook attachment, mix the yeast, water, 3 tablespoons of the oil, the sugar, flour, and fine sea salt on low speed until a ball forms, 3 to 4 minutes. Remove the bowl from the mixer, pour 1 tablespoon of the oil over the dough, and rub with the oil to completely coat. Cover the bowl with plastic wrap and set aside to rise until doubled in size, 30 to 45 minutes.
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3
Cut the grapes in half and remove the seeds, keeping the skins with the grapes, if they come away from the fruit. Set aside until ready to use.
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4
Transfer the risen dough to the prepared baking dish and evenly press the dough into the pan, covering the entire surface. Dock the dough with your fingertips, making holes all the way through. Drizzle the dough with the remaining 2 tablespoons oil. Sprinkle with rosemary needles, grapes and skins, and coarse sea salt. Lightly cover the pan with plastic wrap and set aside to rise until doubled in size, 20 to 30 minutes. Carefully remove the plastic wrap and bake until golden brown and a thermometer inserted into the center of the focaccia reads at least 200u00b0F, 20 to 25 minutes.
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5
Let the focaccia cool in the pan until warm. Slice and serve with ice cream (if using).
