In Jain diet, grains, legumes, and corn are generally allowed in dinner, as long as they are prepared according to Jain rules.

Main Jain guidelines:

• Use fresh, non-stale food.
• Avoid root vegetables like onion, garlic, potato, carrot, beetroot, radish, etc.
• Avoid food after the time limit followed in your tradition, especially night eating in stricter practice.
• Cook and eat with ahimsa and simplicity.
• Avoid items that may contain invisible living beings due to fermentation, sprouting, or improper storage.

About the foods you asked:

• Grains: Generally allowed
• Legumes / dals / beans: Generally allowed, if fresh and properly cooked
• Corn: Generally allowed

If you meant “Can Jain people eat these at dinner?”

• In many Jain households, yes, they can be eaten.
• But some Jains avoid eating after sunset or keep dinner very light, depending on their observance.

If you want, I can also give you a simple Jain dinner food list of allowed and not allowed items.