Preheat oven to 350 degrees

Prepare a 9-inch springform pan lined with parchment paper, greased and floured.

1. Sift the flour, baking soda and salt together in a spacious bowl.
   
   
2. Combine the sugar, eggs and butter in the bowl of an electric mixer and beat until smooth.
   
   
3. Pour in the buttermilk and mix until combined.
   
   
4. Add the Guinness draught and mix well.
   
   
5. With the mixer on medium speed, add the dry mixture to the wet ingredients in several additions. Scrape down the bowl and beat thoroughly, but not excessively, between each addition.
   
   
6. Pour the batter into the prepared cake pan and place on the middle rack of the preheated oven.
   
   
7. Bake for 55 to 60 minutes, or until a knife inserted in the center comes out clean.
   
   
8. Cool to room temperature and unmold. (See How to Remove a Cake from a Springform Pan.
   
   
9. Serve with lightly sweetened whipped cream.