Marmalade

Marmalade is a jelly that kept the peel. Ohio State: soft fruit jellies containing small pieces of fruit or peel; they often contain citrus ¹. Culinary English sometimes treats “marmalade” as citrus-only; extension language is slightly broader. Either way, the peel is not a garnish. Citrus albedo is a pectin source, and the oil in the zest is aroma you cannot get from juice alone.

Why citrus cooperates #

Citrus is high in both Pectin and Acidity relative to a ripe strawberry. That is why marmalade can set without the same added-pectin dependence as strawberry Jam — and why bitterness is a variable, not an accident. Pith and boiling time change how much bitterness you keep.

Observation #

Look for peel distributed through a clear gel, not a jammy sludge with a few strips on top. Taste bitterness separately from sweetness so you can decide whether the next batch needs thinner peel or a longer first boil of the rinds.

Safety #

Marmalades are listed among acid foods that can be boiling-water canned when you follow a tested process ¹. This page does not supply one. See Canning.