To make the overnight sponge, stir down your refrigerated starter, and remove 1 cup.

In a large mixing bowl, stir together the starter, flour, sugar, and buttermilk.

Cover and let rest at room temperature overnight.

In a small bowl or mixing cup, beat together the eggs, and oil or butter. Add to the overnight sponge.

To make the waffles: Add the salt and baking soda, stirring to combine. The batter will bubble.

Pour batter onto your preheated, greased waffle iron, and bake according to the manufacturers instructions.

Serve waffles immediately, to ensure crispness. Or hold in a warm oven till ready to serve.