Fill a pot with enough water to cook the noodles and set the stove to high heat. When the water just begins to boil, add in the noodles. We used soba that came in bunches. For 4 adults, Mom cooked 3 bunches which left us happily full and a little extra as leftovers.
Let the noodles cook for about 5 minutes while mixing constantly. Lower the heat to medium to avoid a strong boil. Taste and cook a little longer if necessary.
Transfer the noodles into a colander and run cool water to stop the residual heat from overcooking the noodles.
When the noodles are cool to the touch, add a large handful of ice cubes and mix the noodles and ice cubes together. Let the noodles drain and get even colder.