Whisk the cornmeal, salt and sugar together in a bowl.
Pour in the boiling water and stir until a thick, smooth paste forms. This softens the cornmeal so the cakes are not gritty.
Stir in the milk until the batter is thick but spoonable. Let it rest 5 minutes, then add a splash of milk if it has stiffened.
Warm a skillet or griddle over medium heat and melt about 1/2 tbsp butter.
Spoon about 3 tablespoons of batter per cake into the pan and flatten gently to about 1/2 inch thick. Cook 3 to 4 minutes until the edges are crisp and golden.
Flip and cook another 3 to 4 minutes. Repeat with the remaining batter, adding butter as needed. You should get about 8 cakes.
Serve warm with butter and maple syrup, or with a fried egg for a savory plate.