title_body: What should I expect from a Belgian double (dubbel)?
upvoted_answer: As with any style, there's a fair deal of variation from one brewery to another.  At a high level, though, you can expect them to be darker (although not stout-dark), rich, and malty.  Expect a complex taste, with many notes and flavors.
  
  More specifically, the BJCP have this to say (abridged):
  
  
  Aroma: malty sweetness, hints of caramel or chocolate, and moderate fruity esters.  Some will have a little spice to them.
  Appearance:  Dark amber to copper in color, Large, dense head.
  Taste: Same as aroma. Alcohol flavor, if any, should be mild and not solvent-y.  No or minimal hop flavor.
  Mouthfeel: Medium-full body. Medium-high carbonation.
  
  
  See here for the full description.