Answer

Yes, generally eating basil/tulsi during Ekashna in Chaumasa is considered a lapse from the vow, and if done knowingly, it is taken as paap in Jain discipline.

Explanation

• In Jain practice, Ekashna means observing one meal and maintaining restraint.
• During Chaumasa, many Jains are extra careful about food because of higher chances of harm to tiny जीवs and increased discipline.
• Basil/tulsi leaves are plant-based food, and taking them knowingly in a restricted observance is usually considered a violation of that observance.
• If it was accidental, unknown, or unavoidable, the karmic burden is different from intentional consumption.

Spiritual Understanding

In Jain Dharma, the main point is awareness, restraint, and non-violence. When a rule is broken knowingly, it creates more karmic binding. When it happens unknowingly, one should not panic, but do:

• Alochana: honest inner confession
• Pratikraman: repentance and purification
• Future caution: greater care next time

Takeaway

So, yes, knowingly eating basil in Ekashna during Chaumasa is generally considered a fault/paap in Jain observance. If it happened accidentally, sincere repentance is enough. The emphasis in Jainism is on care, remorse, and correction, not self-condemnation.