In a large bowl, whisk together the flour, salt, honey and instant yeast. Add the water. Using a rubber spatula, mix until the liquid is absorbed and the ingredients form a sticky dough ball. Rub the surface of the dough lightly with olive oil. Cover the bowl with plastic wrap and place in the refrigerator immediately for at least 12 hours or for as long as three days.
Line two 8 or 9 inch pie plates or a 9×13-inch pan with parchment paper or grease with butter or coat with nonstick cooking spray. Pour a tablespoon of oil into the center of each pan or 2 tablespoons of oil if using the 9×13-inch pan. Using two forks, deflate the dough by releasing it from the sides of the bowl and pulling it toward the center. Rotate the bowl in quarter turns as you deflate, turning the mass into a rough ball.
Use the forks to split the dough into two equal pieces (or do not split if using the 9×13-inch pan). Place one piece into one of the prepared pans. Roll the dough ball in the oil to coat it all over, forming a rough ball. Repeat with the remaining piece. Let the dough balls rest for 3 to 4 hours depending on the temperature of your kitchen (Note: no need to cover for this room temperature rise).
Set oven or Big Green Egg with covEGGtor to 425°F. (Here you can add seasoning/herbs to the top of the dough like rosemary, garlic, tomato slices, etc.) Pour a tablespoon of oil over each round of dough (or two tablespoons if using a 9×13-inch pan). Rub your hands lightly in the oil to coat, then, using all of your fingers, press straight down to create deep dimples. If necessary, gently stretch the dough as you dimple to allow the dough to fill the pan. Sprinkle with flaky sea salt all over.
Transfer your pan to the oven or Big Green Egg and bake for 25 to 30 minutes, until the underside is golden and crisp. Remove the pan and transfer the focaccia to a cooling rack. Let it cool for 10 minutes before cutting and serving; let it cool completely if you are halving it with the intention of making a sandwich.
