Answer

In Jain Dharma, onion is generally not allowed because it is a root vegetable and its use involves harm to many living beings.

But dry ginger is usually treated differently in many Jain traditions because it is used in a dried medicinal/spice form, not as a fresh root vegetable for taste or indulgence.

Explanation

The main Jain concern with root vegetables is:

• They grow underground.
• Pulling them out destroys the whole plant.
• They may contain countless subtle living organisms.
• They are often considered to increase taste-attachment and carelessness in food habits.

Onion is avoided because it is a root/bulb vegetable and is also considered stimulating to passions.

Dry ginger is often allowed in small quantities because:

• It is dried and processed.
• It is mainly used as a spice or medicine.
• It is not generally eaten as a fresh root vegetable.
• Traditional Jain food practice has accepted certain dried spices differently from fresh root vegetables.

However, practices can differ by family, sect, and level of strictness. Some very strict Jains may avoid ginger completely, including dry ginger.

Spiritual Understanding

Jain food rules are not only about the object itself, but also about:

• How much violence is involved
• Whether the food increases attachment
• Whether it is necessary for health
• Whether it supports self-control and compassion

So onion is avoided as a regular food item, while dry ginger may be accepted as a limited spice or medicinal ingredient in many Jain households.

Takeaway

Onion is generally prohibited, while dry ginger is often allowed in limited use because Jain tradition treats dried medicinal spices differently from fresh root vegetables.