Preheat oven to 450° F. Wash the bok choy in a sink of water, then dry it on a large towel or in a salad spinner, making sure it’s completely dry.
Cut the bok choy in half lengthwise, then lay it out on a baking sheet with the stems towards the edge of the pan.
Peel and crush the garlic cloves. Heat the olive oil in a small pan over medium-low heat and cook the garlic for a couple minutes. Once cooked strain the oil and discard the garlic. Set oil aside to cool.
Drizzle cooled oil over bok choy and season with salt and pepper to taste.
Put the pan in the hot oven and bake for about 8 minutes, or until it’s tender to your preference. Once done, transfer to a serving plate and garnish with a squeeze of lemon.