Bring 8-10 cups of water to a rolling boil in a large pot. You need plenty of water so the spinach wilts quickly and evenly.
Drop the spinach into the boiling water and blanch for 30 seconds to 1 minute, keeping the lid off. Stir with a wooden spoon to ensure all leaves get submerged — fresh spinach wilts fast.
⏱ 1 min
Drain the spinach immediately and rinse under cold running water several times. This stops the cooking and removes any grit that might still be clinging to the leaves.
Squeeze the spinach firmly with your hands to remove as much water as possible, then cut into bite-size pieces. Getting the water out is crucial — wet spinach will dilute the seasoning.
Combine the drained spinach with garlic, green onion, soy sauce, sesame oil, and sesame seeds in a mixing bowl. Use your hands to gently toss everything together until the spinach is evenly coated.
Transfer to a serving bowl and sprinkle with silgochu if using. The red pepper adds a mild heat and beautiful color contrast.
Serve alongside rice as part of a Korean meal. This banchan keeps well in the refrigerator for 2-3 days.