I’ll answer from a Jain (ahimsak, satvik) point of view.

Here is a simple one‑day vegetarian (preferably vegan) plan you can follow or adapt:

Morning (after sunrise)

• Warm water
• Fresh seasonal fruit (avoid very old, overripe, or cut fruits kept long)
• Soaked nuts (almond, walnut) if you take them – avoid honey

Breakfast

• Upma / poha with vegetables
• Or vegetable daliya / oats
• Or phulka/roti with simple sabzi (low oil, not very spicy)

Lunch (main meal of the day)

• Phulka/roti (without ghee if you are vegan)
• 1–2 vegetable sabzis (seasonal, not root vegetables if you follow stricter rules like many Jains)
• Dal or moong/chana/sprout curry
• Plain rice / khichdi
• Salad (cucumber, tomato, etc., freshly cut)

Evening

• Light snack: roasted chana, fruits, or light homemade snack
• Herbal tea / lemon water (no honey if strictly vegan)

Dinner (before sunset if possible, or at least light)

• Very light and simple:

- Khichdi / daliya / vegetable soup - Or 1–2 phulka with very light sabzi

• Avoid heavy, fried, or very spicy food at night

General Jain guidelines you can follow today

• Strictly avoid: meat, eggs, fish, alcohol.
• Prefer: freshly cooked food; avoid stale/refrigerated food if you can.
• Eat with awareness: think of ahimsa and gratitude to all living beings.
• Do not overeat; leave some space in the stomach.

If you tell me:

• whether you eat after sunset or not, and
• whether you avoid roots (potato, onion, garlic, etc.),

I can suggest a more precise menu for you.