If by “part Ishan” you mean Paryushan (Pariyushan), here is the simple, traditionally accepted guidance on what is allowed. The aim is ahimsa, simplicity, and day‑time-only eating.

Generally allowed (when not fasting)

• Grains and flours: rice, wheat, jowar, bajra, barley; plain roti, khichdi, rice, upma (non‑fermented).
• Pulses and dals: moong, toor, chana, urad, masoor (not sprouted).
• Non‑root, non‑leafy vegetables: gourds and pumpkins (lauki, tori, tinda, ash gourd, pumpkin), okra, capsicum, eggplant, cucumber, tomatoes as per your maryada.
• Fruits and dry fruits: fresh, clean, uninfested; eat promptly in daylight.
• Fats and seasonings: ghee/oils prepared fresh; rock/sea salt; dry spices like cumin, coriander seeds, black pepper, cloves, cardamom, cinnamon; asafoetida (hing). Avoid ginger and turmeric.
• Milk is generally allowed; many avoid all fermented milk products (curd, buttermilk, paneer/cheese) to keep the vrata strict.
• Water: boiled and filtered; taken only in daylight.

Strictly avoided during Paryushan (both traditions)

• Root vegetables (kand‑mool): potato, onion, garlic, carrot, beet, radish, sweet potato, yam, etc.
• Green leafy vegetables (hari‑shaak/saag) during the festival days.
• Fermented items: curd, buttermilk, paneer/cheese, yeast breads, idli/dosa batter, vinegar, alcohol; also sprouts and mushroom.
• Eating or drinking after sunset; stale/leftover food; outside/packaged food of doubtful purity.

Tradition notes

• Shvetambar Paryushan (8 days): strong insistence on no leafy greens for all days; many observe ekasana/biyasana, boiled food, and very simple menus.
• Digambar Das‑Lakshan (10 days): same spirit with equal or greater simplicity; often one plain meal a day and boiled water only in daylight.

Essence

• Keep food minimal, non‑violent, and pure; eat only in daylight and focus on pratikraman, svadhyaya, dhyana, and kshamapana.

Helpful, short guides from JainKnowledge:

• What all foods are allowed in Paryushan
• Food items allowed in Paryushan

If you meant something else by “part Ishan,” please specify in your next message.