Aroma and flavour The odour and flavour of cumin is derived largely from the essential oil, which contains cumaldehyde or cuminic aldehyde as the main constituent. Other ingredients of the oil are dihydrocuminaldehyde, dl-pinene, dâ??pinene, para-cymene, dipentene, and cuminyl alcohol. Synthetic cuminaldehyde is an adulterant to cumin oil and is very difficult to detect chemically. The dried seed of cumin has 2.5 to 5 percent essential oil on a dry weight basis and is obtained by steam distillation. Cumin is the dried, white fruit with greyish brown colour of a small slender annual herb. The surface of the fruit has 5 primary ridges, alternatively has 4 less distinct secondary ridges bearing numerous short hairs. The plant is 15 to 50 cm high. The aromatic seed like fruit is elongated, ovoid, 3 to 6 mm long, slightly bitter and has a warm flavour. The flowers are white or rose coloured in small umbels.