Liquorice root vs fennel

Two anise-adjacent materials constantly blended together and often assumed to be the same flavour. One is sweet and one is not.

botanical

What is being compared

Point by point

AspectLiquorice rootFennel seed
What it isA Eurasian legume root, dried and sliced or shredded.The seed of a Mediterranean Apiaceae.
SweetnessGenuinely sweet, and it sweetens whatever it is simmered with.Not sweet; the aniseed reads as sweetness and is not.
FlavourAnise-adjacent with a heavy, rounded depth.Cleaner and lighter aniseed.
PreparationSimmered, like every root.Steeped or lightly simmered; the seed gives up quickly.
In a blendDominates. Adding it is a flavour decision as much as a sweetening one.Blends readily and sits behind other things.
Where it is usedConfectionery across northern Europe, and blends everywhere.Mukhwas in India, and infusions across Europe and the Middle East.
The confectionery trapLiquorice sweets are usually flavoured with anise oil rather than the root.No equivalent; fennel sweets are fennel.

The short answer

If a blend tastes overwhelmingly of aniseed and is also sweet, it is liquorice. Fennel is the one you can use without redesigning everything around it.

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