Fennel brings a rounded anise-like flavour
Fennel's small ridged fruits give an anise-like sweetness with a rounded herbal background.
The spice is not the vegetable bulb
Fennel infusion usually uses the small dried fruits commonly called fennel seeds. They are elongated and ridged, with a greenish to brownish colour. This is a different form of the plant from the pale bulb sold as a vegetable. A picture of sliced fennel may suggest the right flavour family, but it does not show the actual material in a typical packet of fennel tea.
The seed-like fruits carry an aromatic sweetness often compared with anise or liquorice. That comparison describes a family resemblance, not a mixture of those ingredients. A plain fennel product can smell sweet and rounded while containing only fennel.
Roundness rather than sharp mint
Fennel's freshness is not the cooling impression of peppermint. It tends to feel warmer, softer and more rounded, with a herbal or gently woody background. The familiar sweet aroma can be prominent even when the liquid is not sugary. This is another case where the smell of sweetness and the taste of added sugar should be kept separate.
Some cups show a more noticeable dry or slightly bitter finish. That does not automatically cancel the sweet-smelling opening. Following the sequence from aroma to aftertaste gives a fuller picture than calling the ingredient simply sweet. A good description can accommodate more than one sensation at a time.
When three similar-looking names meet
Fennel often appears with anise and caraway. The three are different spices, despite their small seed-like appearance and frequent partnership. A blend can therefore taste more layered or more forceful than fennel alone. If the packet also contains mint, liquorice root or lemon balm, those additions create further changes that should not all be credited to fennel.
For learning the ingredient, the most useful reference is a clearly labelled, food-grade plain product. Look at the ridges and size, then connect them with the aroma of the cup. There is no need to frame this as a medicinal exercise. Fennel has a recognisable culinary character on its own, and understanding that character makes familiar mixed herbal infusions less anonymous.
