Answer

During Dashlakshan Parva, many Jains avoid mustard seeds, mustard oil, and mustard-based foods, especially if they are following stricter religious discipline.

Explanation

Dashlakshan Parva is a sacred time for increasing:

• Ahimsa — non-violence
• Sanyam — self-control
• Tapasya — austerity
• Shuddhi — purity of food, thought, and conduct

Mustard is often avoided because it is considered a strong, stimulating food, and mustard oil/seeds may be restricted in many Jain household traditions during Paryushan/Dashlakshan observance.

However, exact food rules can vary by:

• Family tradition
• Sampraday
• Level of vrat or tapasya
• Guidance of one’s Guru or local sangh

Spiritual Understanding

The main spirit of Dashlakshan is not only “what to eat,” but developing restraint, simplicity, and awareness. If there is doubt, it is better to choose a simpler alternative and avoid mustard during the Parva.

Takeaway

Best practice: Avoid mustard during Dashlakshan Parva, especially if you are observing religious discipline. For your specific vrat, follow your Guru, family, or sangh maryada.