Y'ALL! This is awesome, and it's going on through mid April. Here's how you get it.
In order to get the Buy One Get One Free deal, you have to do the following.
2) The order you place must include at least one ‘number one’ Whataburger. 🍔
3) If you want to add anything extra on to your burger, that is additional. 🍅🥬🥓🥑
The deal will run through April 19th.
See the Whataburger image here.