Hi Matt
Glad your having success with this base

Crikey, where does the time go, My first cR0 inspired video, March 2011.
This recipe/method still stands up today.

When you've cooked it a few times and understand the principle that Garabi, is 80-90% Onion Water, and is a neutral base.
You can tweak this with any flavour you put into it.E.G. If you add a couple of green chillis to the pot at the beginning, you will taste a slight chilli heat in the finished base.
Add a couple of tbs of mix powder and it will have a stronger curry taste.
Likewise, Muslin cloth is very handy, for trying things out.
If you make a bag, add a couple chicken thigh's, 2 Tej Patta, a small piece of cassia bark, couple black cardamom, tie the bag, add it at the beginning
and this will change the taste completely.The flavour of the chicken juices/fat/stock and especially cinnamon will shine through.

The downside on this is, if you flavour the base too much, the same background flavour carries through on every final curry dish you cook.
Cabbage, if your not going to use it for anything else, just cling film it and stick it in the freezer.
cheers Chewy