Mix the vinegar and salt. Put the broccoli in a large ziploc bag and pour the vinegar mix over.
Heat up a skillet with the oil inside.
Cook the garlic, black pepper and onion powder for 40 seconds while stirring. Take the pan off the fire and mix in the sesame oil. Let cool fully.
Add this mix to the broccoli bag and mix around the bag to fully coat broccoli.
Let it marinate in the fridge for at leat 60 minutes.