Chef John's Whole Wheat Ciabatta

Details

Ingredients

• 1 cup warm water
• ½ cup all-purpose flour
• ½ cup whole wheat flour
• ¼ cup rye flour
• ¼ teaspoon active dry yeast
• 1 cup all-purpose flour
• 1 cup whole wheat flour
• ½ cup water at room temperature
• 2 tablespoons shelled sunflower seeds
• 1 tablespoon polenta
• 1 tablespoon ground flax seeds
• 1 ¾ teaspoons salt
• 1 ½ teaspoons honey
• 1 teaspoon all-purpose flour, or as needed
• ½ teaspoon cornmeal, or as needed
• water as needed