Step 1

Heat a grill pan over medium-high heat. Brush with olive oil.

Step 2

Mix rice vinegar, chile oil and salt together in a medium bowl. Add bok choy and scallions and toss to coat.

Step 3

Place bok choy and scallions on the grill pan and cook until char marks appear, flipping once, about 6 minutes total.

Step 4

Remove to a platter, then drizzle with remaining sauce mixture and sesame seeds.