In regular sizes an Old Fashioned is 2oz of Bourbon Splash of Angusturo
Bitters, Sugar (1 lump or equivalent), Table spoon of water, Orange slice and
a cherry.
Put the orange, cherry, bitters, water and sugar into the glass - mash well
then pour the bourbon in on top.
If you are making bulk then you can just mash all the fruit sugar etc in a
large container then spoon into the glass when you are ready to pour.
Make sure you get some juices in the glass tho', that is what makes the flavour
Have a fun time
Dazza