Clean the shepherd's purse thoroughly, removing the roots and any yellow leaves.
Add a little salt to boiling water and blanch the shepherd's purse for 1 minute. Rinse in cold water and squeeze out the excess moisture.
Place the blanched shepherd's purse in a bowl and add gochujang, minced garlic, vinegar, sesame oil, sugar, and crushed sesame seeds. Mix well.
Taste and adjust seasoning with salt if needed.