Sugar pack

A sugar pack is fruit mixed with Sugar (or covered with syrup) for the freezer. NCHFP: it is safe to freeze fruits without sugar; sugar is not used as a preservative but only to maintain flavor, color, and texture ¹. That sentence is the whole mechanism. The cold does the keeping. Sugar does the quality.

Artificial sweeteners can replace sweetness. They do not furnish sugar’s beneficial effects — thickness of syrup and color protection ¹. See Syrup for the canning cousin of that syrup.

This is not jam, and it is not a canned syrup pack #

Jam is a pectin gel; a sugar-packed berry is still a berry. Canning fruit in syrup is a heat process plus a quality liquid ². Freezing fruit in sugar is neither. Do not put a freezer bag through a water bath and call it canning.

Vegetables going to the freezer are a different prep: Blanching, not sugar ³.

What to notice #

Sugar draws juice; the fruit looks glazed and sits in its own syrup. Unsweetened frozen fruit looks frostier and weeps more on thaw. Color that holds is the sugar doing its stated job; brown, dry freezer-burn patches are air, not a missing cup of sugar.

Sugar-to-fruit ratios are specific to the fruit-freezing process; use NCHFP’s directions for those numbers. A refrigerator jam and a sugar-pack are both cold storage; only one was cooked to a gel. See Freezing and Preserving.