Step 1

Add the bread flour, yeast and salt to the bowl of an electric mixer fitted with a dough hook. Turn the mixer on low speed for just 15-20 seconds to evenly distribute the ingredients. Add the warm water. Turn the mixer on low speed for about 5 minutes, making sure all of the ingredients are evenly incorporated. The dough will be very wet, loose and sticky. Remove the bowl from the mixer and cover with plastic wrap or a silicone lid.

Step 2

Allow the dough to rest in a dry, warm place for 30 minutes. Once rested, wet your hands slightly to ensure the dough doesn’t stick to your fingers. With one hand, scoop the edge of dough on the farthest side from you, and stretch slightly to gather it in the middle. Rotate the bowl slightly and continue this process until all edges of the dough have been folded to the center. Cover the bowl up again with the plastic wrap or silicone lid, and allow to rest for an additional 30 minutes or until doubled in size.

Step 3

Prepare a baking sheet by adding 2 tablespoons of olive oil to the center, and using a pastry brush or fingers to evenly coat the pan, including the sides. Turn the focaccia dough out onto the oiled baking sheet, using a rubber spatula to get all of it out. With oiled hands, gently work the dough and stretch until it almost covers the whole pan. Don’t worry if the dough retracts or doesn’t reach the ends of the sheet. Be careful to try and not release bubbles in the dough during this process. Allow the dough to rest in a warm place, uncovered, for another 30 minutes.

Step 4

Preheat the oven to 400 degrees F.

Step 5

With oiled fingers, gently stretch the dough to cover the entire pan. Make indentations in the dough with your fingers to form dimples all throughout the dough. Distribute the grapes over the focaccia. Sprinkle with the rosemary and the coarse or flakey sea salt. Finish with a generous drizzle of oive oil all over the dough.

Step 6

Bake for 40-50 minutes, or until the crust is golden brown. Use a metal spatula along the edges if they stick to the pan. Slice into squares and serve.