Of the many web sites that provide alcohol drink recipes (like
drinknation.com, webtender.com, idrink.com by way of example) which
are the top 3 in terms of web traffic and which 3 have the best (most
complete) collection of recipes?

After doing my research on "drink recipe" websites, I have found this data:

                            
Website Name                   www.webtender.com  
Back Links                     2,170
Indexed Pages  
PR 
Traffic Rank 
Reach Per Million Users 
Average Page Views per user

After doing my research on "drink recipe" websites, I have found this data:

                            
Website Name                   www.webtender.com  
Back Links                     2,170             
Indexed Pages                  154,000         
PR                             5/10              
Traffic Rank                   20,930 
Reach Per Million Users        50
Average Page Views per user    4.1


Website Name                   www.epicurious.com
Back Links                     6,950             
Indexed Pages                  251,000         
PR                             8/10              
Traffic Rank                   1,888
Reach Per Million Users        406
Average Page Views per user    6.1

Website Name                   www.barnonedrinks.com/
Back Links                     950             
Indexed Pages                  37,000         
PR                             5/10              
Traffic Rank                   153,390
Reach Per Million Users        7,45
Average Page Views per user    2.8

You said 3 websites, here there are three more for comparison

Website Name                   www.idrink.com/
Back Links                     1030             
Indexed Pages                  27,600         
PR                             6/10              
Traffic Rank                   81,637
Reach Per Million Users        14
Average Page Views per user    4.0

Website Name                   www.drinksmixer.com/
Back Links                     2590           
Indexed Pages                  145,000        
PR                             5/10              
Traffic Rank                   22,109
Reach Per Million Users        59.5
Average Page Views per user    3.0


Website Name                   www.drinknation.com
Back Links                     288           
Indexed Pages                  19,400       
PR                             5/10              
Traffic Rank                   137,970
Reach Per Million Users        10
Average Page Views per user    2.0



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Back Links                  : How many websites point to it
Indexed Pages               : How big it is
PR                          : How relevant is its content
Traffic Rank                : Out of something like 4,000,000 ... 
                               the closer to 0, the better
Reach Per Million Users     : How much traffic it gets on average per month
Average Page Views per user : How may pages the user views.
 
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I hope this is the information you were looking for.

;)Sorry about the other post