Got this for a fiver

Beer Milkshake

• 4 scoops (about 8 oz) vanilla ice cream
  
• 6 oz beer (porter preferred)
  
• 2 oz milk
  

• 2 tab chocolate syrup (optional)

  Mix ingredients in a blender until smooth. Add more ice cream and reduce milk for thicker shake. Increase milk and reduce ice cream for thinner shake. For better favour, use porter ice cream. 
  *It may sound odd, but it can be quite good. It is a staple at a pub I frequent. Porter is what makes this work the best, though stout is a viable substitute. I'm sure Lister would prefer it lager favoured. Still, where can you get Porter ice cream?*