Yet another different multigrain sourdough recipe that I've come up with! In this recipe, you soak the grains and seeds overnight in the proofed starter, then retard the dough for 8 hours to improve the sourdough flavour. It is dense, grainy, and delicious! Recipe #384672 is a mixture that is my mock up of the product by the same name on King Arthur's website. If you don't want to make the entire recipe, you may add 2 tbsp each of rye flakes, wheat flakes, whole oat groats, millet, seven-grain cereal, flax seeds, and sunflower seeds, plus 1 tbsp each of poppy and sesame seeds.