Rinse the soybeans thoroughly and soak them for 6-8 hours.
Boil the soaked soybeans in boiling water for 5-10 minutes, then rinse with cold water.
Blend the boiled soybeans with cold water and salt until smooth.
Cook the somyeon noodles and rinse them in cold water.
Place the noodles in a bowl and pour the soybean soup over them.
Top with cucumber, tomato, boiled egg, or other desired garnishes.