In late summer, housewives used to get very nervous about what they had “put back” to feed their families during the winter. Supermarkets have solved most of the end-of-harvest jitters, but there’s still something special about saving the last of summer. Freezing rather than canning lessens cooking time, reduces needed sugar and keeps more of ingredients’ fresh taste. Here are several sauces, a couple of them keepers, to let your family enjoy the waning freshness of summer and the bounty of fall.