Heat 3 tablespoons vegetable oil in a large skillet set over medium-high heat.
To the hot oil add the halved bok choy pieces to the skillet, cut side down; cook for 2 minutes.
Turn over the bok choy and cook for a minute. Add more oil, if needed.
Cover and continue to cook for about 3 to 4 minutes, or until crisp-tender. Turn the bok choy couple times while cooking.
When done, remove bok choy from the skillet and set aside.
Return skillet to the heat and add a tablespoon of vegetable oil.
Stir in the minced garlic and cook for 20 seconds, or until fragrant.
To the skillet, add soy sauce, sriracha, rice vinegar, lime juice, and sesame oil; whisk until well combined.
Cook for 1 minute, or just until the sauce starts to thicken.
Remove from heat.
Drizzle or brush the sauce over the bok choy.
Garnish with sesame seeds.