Slice the bok choy in half lengthwise and remove any stringy outer leaves. Add to a pan of boiling water and simmer for 3-4 minutes until just tender. Drain completely.
Step 2
Whisk together the chili flakes, balsamic and lemon juice.
Step 3
Heat the olive oil in a large skillet over a low/medium heat. Thinly slice the garlic and add to the pan, sweating gently until tender. Add the bok choy and cook for a minute or two on both sides to brown a little.
Step 4
Add the balsamic and chili mixture and stir fry over a medium heat for 2-3 minutes until golden and caramelized all over.