Stir the sponge and add 1 cup milk, ¼ cup runny honey, ¼ cup vegetable oil, 2 cups of the flour, and mix a little.
Add 2 teaspoons salt and ½ cup warm water.
Mix well and add 2 to 3 cups whole wheat flour until it becomes a dense dough, adding the rest of the ½ cup water as needed. You might not use all the liquid, maybe a tablespoon or two less. The batter will be thick but soft and not floury.
By hand: turn onto a lightly floured counter and knead for 8-10 minutes. It will be a little sticky, but add flour only if necessary.
Stand mixer: attach the dough hook and knead for about 8 minutes at medium speed, adding extra flour only if needed if the dough is not pulling out from the sides after 5-6 minutes.
Put in an oiled or greased bowl, turn so that the entire surface is greased, cover, and let rise until it doubles in volume in a draft-free, tempered place.
Transfer the dough to a clean countertop and punch down lightly to let out the gas.
Divide the dough into two parts and sprinkle two loaf pans with oats or polenta.
Form the dough into logs, rolling it (as for cinnamon rolls) but pressing the edges with each roll to ensure there are no (or very few) air holes when the bread is baked. The post above includes a video showing the step-by-step process to form the loaves.
Put the formed logs in the prepared pans, cover, and leave to rise until doubled or very puffed, about 30 to 40 minutes. Being all whole wheat, this bread will rise significantly, very little in the oven so allow it to rise well this last time.
Turn the oven to 350°F (180°C) about 15 minutes before baking.
Bake loaves for about 50 minutes or until golden brown and dry, and the bottoms sound hollow when lightly tapped.
Let cool completely on a wire rack before cutting.