03In a small bowl, whisk together the eggs and olive oil until thoroughly combined. In a bowl, combine cooled potatoes with the sponge, flour, sage, lemon zest, pepper, and 2 teaspoons of salt. Mix to evenly distribute the ingredients. Add the egg mixture to potato mixture, and stir until thoroughly combined. Use a rubber spatula to scrape down the sides of the bowl. You should have a thick, sticky batter. Add a bit more flour, if needed. Cover the bowl with a towel and set aside in a warm place to rise until doubled in size, for 1 1/2 to 2 hours.04Heat the oil in a deep-fryer to 375 degrees F.05Scoop 1 tablespoon of the risen batter at a time, and use another spoon to scrape it into the hot oil. Don't crowd the fryer. Fry fritters until golden brown, 2 to 3 minutes, turning them over occasionally. Drain the fritters on paper towels to absorb any excess oil. Sprinkle with sat and serve warm.06Entertaining Tip: You can fry up a couple of batches of these an hour before your guests arrive and simply heat them again in a 300F oven before serving. Or keep warm in a 250F oven after making them. The fritters are great alone but they are equally great with a couple of dipping sauces.