In the Marley Spoon test kitchen in Berlin, there was one mayo brand that reigned supreme: Hellmann's. It's not surprising.

But thank goodness they left their flour paste out in the sun a little too long so that corner store reubens, West Coast cheesesteaks, and walk-up window bánh mì could all be a part of Seattle history ...

Sure, if you eat a sandwich right away, it's unlikely to get too soggy -- but prepping one for later? That's another story.