Fill the pot halfway with water and put it on the stove. Turn the heat to high and bring the water to a boil. (You’ll know the water is boiling when you see bubbles breaking all over its surface.) Add the soba noodles and cook until tender, about 5 minutes (or follow the directions on the package). To test a noodle to see if it’s done, carefully fish it out with the fork, run it under cold water, and taste it. Drain the noodles in the colander and rinse with cold water.
Put the soy sauce, scallions, lemon or lime juice, sesame seeds, sesame oil, and ginger in the bowl and mix well.
Add the soba noodles and stir well.
Add whatever extras you like and stir well. Now taste the salad. Does it need more lemon or lime juice, or soy sauce? If so, add it and taste again.
Serve right away or cover and refrigerate up to 2 days.