Here is a simple Jain tithi dinner menu:

• Fruits or fruit salad
• Moong dal khichdi without onion, garlic, or root vegetables
• Plain rotli / chapati
• Paneer or dudhi sabzi
• Dal or moong soup
• Rice
• Cucumber, tomato, and salad
• Curd or buttermilk
• Light sweet dish like sukhadi or shiro

For a more strict Jain tithi observance, keep the meal:

• simple and light
• without root vegetables like potato, onion, garlic, carrot, beetroot
• before sunset, if you follow that practice

If you want, I can also give:

• tithi dinner menu for 1 person
• tithi dinner menu for guests
• Jain tithi fasting menu