I would like to make a large amount of multi-grain porridge mixture in one batch, to store and use small amounts of when I need it. The recipe says that the fattier seeds will go rancid if kept for too long, but doesn't say how long that might be.
The recipe includes:
- linseed (flax seed)
- sunflower seeds
- pumpkin seeds
Of these, the linseed and sunflower will be the most fatty.
How long can I keep these, and seeds in general, for?