
Slice bok choy in half and wash well in water. Shake off excess water and dab with a paper towel to dry.
Heatpan or grill to medium heat and add oil.
Place bok choy cut side down onto hot pan and allow to sear for 5-7 minutes. Do not crowd the pan - you may need to cook in batches.
Remove from hot pan and drizzle lemon juice and hoisin sauce. Garnish with sesame seeds and chili flakes if desired. Serve hot.