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Fill a bowl with water, then add the beans. Gently rub the beans together with your fingers to get rid of any dust. Pick out any discolored or misshapen beans loose hulls, or grit. You must pre-soak dried soybeans. If you are starting with fresh soybeans, you can move on to boiling them. Set a colander into the sink,then empty the beans into it. Shake the colander to dislodge any excess water. Once again, if you see any hulls, pick them out and discard them. Transfer the beans into a large bowl or pot. Use 3 cups (700 milliliters) of cold water and 1 teaspoon of salt every 1 cup (200 grams) of soybeans. Place the beans into the fridge, and allow them to soak for 8 to 10 hours. Refrigerating the beans while they soak will keep them from fermenting, especially in warmer climates. Once the beans have soaked, they are ready to cook. Pour them into a colander, then gently shake them to remove any excess water. After this, you can cook the beans as desired.
Rinse the soybeans with cold water. Drain the soybeans. Soak the soybeans overnight in the fridge. Drain and rinse the soybeans one last time.