Line the sieve with four layers of kitchen roll and put the yogurt in this and place over the jug. Stand this on a plate in your fridge in case it drips.
Leave overnight and the next day change to some fresh kitchen roll and repeat the process leave until it stops dripping the clear whey into the jug usually this takes another 24 hours.
Finally tip the drained yogurt into a bowl and mix in the seasonings just add a little at a time and keep tasting you can always add more but you cant take it out if you add too much.
Credit : http://vicki-kitchen.blogspot.com