What specific ingredient must characterize a fruit spread known as 'marmalade'?
Answer
Suspended pieces of peel or pulp
Marmalade is a specific type of preserve distinguished primarily by its source material, typically citrus fruits like lemons or oranges. Its defining characteristic is the inclusion of suspended pieces of peel or pulp within the spread. Although marmalade falls under the general umbrella of preserves, the presence of peel content is what separates it clearly from standard jam or jelly in nomenclature.

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