Sometimes I make korma, satay, masala or pasta sauce for meals in advance. What is the best way to store these, once they're made? Ideally the sauce won't go off within a week and I want minimal loss of flavour. I would be grateful if anyone here can tell me the best method of storing them.
When referring to homemade tomato sauce, how it is stored depends on how long one wants to keep it.
If you apply a best-case/worst-case/likeliest-case approach to estimating when you will be using the sauce, you will want to maximize food safety (i.e. shelf life in fridge is shorter than in freezer or in a jar), time to prepare (i.e. defrost), and time to store (i.e. jarring).
If you have a given sauce X, all risks being equal, and you want to store it for one to four weeks, I would recommend freezer bags for the following reasons:
Jarring will have the best shelf life in all likelihood (assuming you don't contaminate your jars, or end up with exploding glass), as freezing your sauce may cause a separation, and in the fridge it will pose a health risk quickly.
Storing sauces in securely closing plastic freezer bags, in the freezer, is my preferred method in the scenario you have outlined as it allows you to portion out smaller quantities, has a good mid-range duration of food safety, and isn't terribly likely to cause any flavor issues within three to six months, let alone in the scope of one. As for defrosting, it sounds like you are already planning out your dishes, and putting a bag of sauce on a plate in the fridge in the morning wouldn't be problematic.