I'd like to give it up for Sriracha.
You can find this delicious spicy sauce at any good Vietnamese restaurant. Please note that this stuff is highly addictive. My girlfriend had a taste of this stuff when we first got together and ever since, she's been hooked. She puts it not only in her pho,and rice plates, but also on her pizza, burritos, tacos, burgers and sandwiches.
I'm not sure what it is about the sauce that makes it so good. I think it's the crack they put in it.
Whatever it is, We love it, and wouldn't change a thing about it.