• 1/2 c. pine nuts or walnuts
• 1/2 lb. cherry tomatoes, halved (about 1 1/2 c.)
To make the sponge: Combine yeast and 1/2 cup lukewarm water in a large bowl or 2-quart storage tub. Stir to dissolve. Whisk in 3/4 cup flour. Cover with plastic wrap and let proof in a warm place until bubbly and doubled in volume, about 30 minutes. Stir in 1 cup lukewarm water and 2 tablespoons olive oil, then stir in the remaining 3 cups flour. Mix only until a dough is formed. Cover and let stand for an hour, then refrigerate overnight.
To finish the focaccia: With parchment, line an 11- by 19-inch sheet pan with a rim. Drizzle the parchment with 1 teaspoon olive oil. Scrape the cold dough onto the parchment, then pat out to fill the pan. If the dough resists, let it rest for 5 minutes, then press with your fingertips to the size of the pan. Cover loosely and let come to room temperature and rise, about 1 hour.