At the brewery we use a 2 litre bottle of vodka epty it and then fill it with about 200 vanilla pods then cram them in then add vodka for about a month or more. less time add too much vodka flavour in my opinion. adding beans and extract tend to make it a fakish vanilla taste. might ust be the way i do it.

for 1500 litres of porter is about a litre and a half vodka vanilla. (not with pods just liquid.)

 

Cheers mate I don't have a month but secondary won't be till next week so I guess I'm buying some vodka for the missus on the way home from work then.