The rye sour can now be used to make your rye bread recipe. You’ll probably have plenty leftover to put in the fridge. The sour may be kept alive and well in the refrigerator forever if it is fed regularly. Store it in a tightly sealed container and feed it once a week. The chopped onion and whole caraway seeds should have been removed by now and discarded after the first day and not used in future feedings. (See instructions below.)☞ TESTER TIP: If you're going to make this recipe infrequently, just make fresh sour each time. There’s no need to keep your sour alive for weeks or months in between uses. If you are going to bake weekly, feed your sour at least once between baking sessions.