In a measuring cup, stir together the rice vinegar, soy sauce, and chili garlic sauce.
In large skillet or wok, heat the sesame oil over medium-high heat. Add the broccoli, onion and kosher salt and cook 5 to 6 minutes until fork tender, stirring occasionally. Add the shrimp and cook 3 to 4 minutes, stirring frequently.
When the shrimp is just about opaque, add the sauce mixture and cook 1 minute. Remove from the heat. Serve with sesame seeds.