In a bowl, mix water, dry yeast, and sugar. Add hard grating cheese, kosher salt, cornmeal, and whole wheat flour. Stir in bread flour until the dough is a coherent mass.
Cover the dough and let it rise for a couple of hours or throw it in the fridge and let it ferment slowly for a day or two.
Wet your hands and stretch and fold the dough until it won't stretch anymore. Coat a mini sheet pan with olive oil and coat all sides of the dough with oil. Cover and let rise at room temperature until quite puffy.
Preheat the oven to 400°F (200°C). Dimple the dough and sprinkle Malden smoked sea salt on top. Bake for 15 minutes.
In a microwave-safe vessel, melt butter with chopped garlic. Add chopped sage.
Brush the Herby garlic butter on top of the hot Focaccia. Cut in half.
Grate gruyere cheese and pile it on one half of the Focaccia. Add brazala and more cheese on top. Sandwich it up.
Bake the sandwich on the bars of the oven until everything is melty and crispy.
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