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To make the overnight sponge: Stir down your refrigerated starter, and remove 1 cup (227g). Note: This is a good opportunity to feed the remainder, if necessary.
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In a large bowl, stir together the 1 cup (227g) unfed starter, flour, sugar, and buttermilk.
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Cover and let rest at cool room temperature (about 65°F to 70°F) for about 12 hours, or overnight.
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To make the batter: In a small bowl or mixing cup, beat together the eggs, and oil or butter. Add to the overnight sponge, stirring just to combine.
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Add the salt and baking soda, stirring to combine. The batter will expand and may bubble a bit.
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To make pancakes: Pour the batter by the 1/4-cupful onto a preheated, lightly greased griddle. Cook until bubbles form and pop on the top side of the pancakes, then turn over and cook until browned underneath.
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To make waffles: Pour the batter onto your preheated, greased waffle iron, and bake according to the manufacturer's instructions. Repeat with the remaining batter.
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Serve pancakes or waffles immediately, with your favorite toppings; or hold in a warm oven until ready to serve.
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Storage instructions: Store any leftovers in the refrigerator for a day or two; freeze for longer storage.