Stir in flour, sugar, and salt until no large lumps remain
Cover, and refrigerate overnight
In the morning, when ready to use, remove batter from the fridge, and sprinkle baking soda over the top
Stir together briefly, but thoroughly. Try not to overmix, as that is what ends up creating rubbery pancakes
Heat griddle over medium heat, and grease well
When griddle is hot, ladle batter using between 1/3-1/2 cup per pancake
Cook on griddle until pancake is brown on the bottom, and bubbles on top pop, and don’t immediately fill back in, flip, and cook until second side is brown.