Dressing for dinner?

The Boy decided to make a stink bomb tonight - or at any rate a concoction in a bottle. 

Vinegar - check. 
Thyme - check. 
Chopped onion - check... 

"Urgh!" he groaned with delight, "This smells disgusting!"

"Err, hate to break it to you - you appear to be making salad dressing..."