January 20, 2012
![The Opera Tavern](https://www.foodista.com/sites/default/files/styles/featured/public/field/image/Screen%20Shot%202012-01-20%20at%208.36.10%20PM.png)
The Opera Tavern in London has found an innovative way to engage its Twitter followers: it offers a monthly secret menu especially for them, which is available at the restaurant for one night -- if you know the password, that is. The Opera Tavern tweets out the ingredients in a special burger and then the password.
The burger below honors the Opera Tavern's first birthday. It boasts a bevy of duck, and the password was "What's the quack?"
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