1. Pour the Harp ale into a pint glass. Add food colouring to bring the Harp ale to a nicely Irish green. Slowly add the Guinness (pour over a teaspoon so that the Harp ale and the Guinness don't mix).
2. Leave a moment to settle (with the finished product you should see the two have seperated, with green Harp Ale on the bottom and Guinness on the top).
3. Take a moment to idolise your new creation (take photographs if nescesary). Yell 'HAIL TO ST. PATRICK, OUR SAVIOUR'