Make the Same-Day Focaccia dough recipe as normal.
During the stretch and folds, add in the grated frozen salted butter (57g/ ½ stick / ¼ cup for each set of folds).
Line the tray with 2-3 tablespoons of salted butter.
Let the dough proof in the tray and then dimple with 2 more tablespoons of salted butter before baking.
