Preheat your oven and a cast iron skillet to 425°F with foil-covered rack in bottom.
In the meantime, cook grits as directed on box until soft (usually about five minutes). Remove from heat
stir baking soda into milk or heavy cream mixture for every cup used and then pour over hot grits while whisking quickly. Set aside to cool a few moments.
In a large bowl, combine dry ingredients: cornmeal, granulated sugar (save the extra 1/4 cup), salt & baking soda
stir until combined well with butter and then slowly pour in milk mixture while whisking constantly. Mix batter just enough to have no lumps - do not overmix.
Pour skillet into preheated oven, add grids directly from pot (keep warm), sprinkle extra sugar on top for a crispy exterior and bake approximately 20 minutes or until golden brown.