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Brittos, bang on Goa's most popular Beach is a must try.  Sip on a nice cold beer {or whatever your poison maybe} while you are treated to a view of all the water sports along the shore. Their food is very good too. We would recommend trying out their Baked Crab, Butter Garlic Prawns or Squid, Prawns in Recheado masala... take a break...take a dip in the ocean and repeat the process all over again.
Click here if you need to find Britto's on the map.

 
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Perched on a hilltop, overlooking the magnificent Indian Ocean and picturesque small Vagator beach lies Thalassa. Not only does Thalassa serves some of the best Greek Food in India but it comes along with a spectacular view of small Vagtor beach . Very laid back, with an excellent menu and wine list and very friendly staff and owner,  Thalassa, comes highly recommend especially around sunset.
Try coinciding your trip with the performance of “Sirtaki”, which is a traditional Greek celebratory  
You may want to make a reservation as they usually tend to get pack even on week days. (+91) 98 50 033 537. 
Click here to find Thalassa. 

 
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For a change of pace (serves dishes from Andhra Pradesh, Tamil Nadu Kerela and even Hyderabad) and for those of you who like it spicy, we highly recommend Gun Powder.
An old Portuguese house converted to accommodate "People Tree" a creative boutique, the garden forms the seating for the restaurant. 
 The South Indian fare is excellent, with the Chicken gravy and devils pork  with appams is a must try.
Click here to find Gunpowder. 

 
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For a restaurant that doesn't limit it self to Goan cuisine, they serve a pretty good Goan fare.  A very reasonably priced fish thali is probably the best seller on their menu, but their prawn biryani is probably some of the best you'll get in Goa. 
The crumb and rechado fried fish in the balcao,  with a beer to cool you down followed by the fish thali and an afternoon siesta, pretty much the susegad way of going about things when in Goa 
Click here to find Starlight.

 
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Available only in, and all over  Goa, this "country liquor" is made from either coconut or the cashew apple, Going with the intent of this page, I recommend the cashew variant. 
Feni, much like other Goans, is pretty rough straight up, however, when mixed with Limca (lemon flavoured cola) transforms into a sweet, smooth and if I may say, very friendly drink (depending on the ratio of Feni to Limca), kinda like a Jack Daniels and Coke.
Again like many a Goan, it loves talking, telling every one around you of your recent (24 hours at times) association.  
Big Boss and Cashewlana are among the more famous brands available, and you'd be better off getting one of them, rather than the "best home made " Feni in Goa, which practically every Goan claims to know off (through his brother-in-law/uncle/neighbour) It's pretty clear that Feni is definitely not made at home, and that a Goan wouldn't leave is house if it really were.
However, if you still feel the need to sample some of the best home made feni, I know  of a place. (my cousin's neighbour).