Check the condition of the bellflower root, cut off the top, and ensure there is no black core visible inside.

Bellflower Root Salad (Doraji Saengchae)
Making Bellflower Root Salad, a practical item for the Korean Food Technician exam.
What You'll Need
Instructions
Make a slight slit in the skin of the bellflower root, then rotate and peel it off.
Make a slit in the green onion and garlic, remove the core, and mince finely.
Cut the bellflower root into 6cm lengths, then slice into 0.3cm thick pieces and julienne.
Pour enough water to cover the julienned bellflower root and add 1 tsp of salt to soak.
Make the sauce by mixing the minced green onion, minced garlic, red chili powder, gochujang, vinegar, sugar, crushed sesame seeds, and salt.
Rinse the thoroughly soaked bellflower root in cold water, rubbing it with your hands to remove the saltiness.
Mix the bellflower root gently with the sauce and place on a side dish plate to serve.