Normally we would fry the medhu vadas as soon as grinding the dal. Here's an easy way to store and fry at a later time. Soak dal and grind the batter, add all seasonings and veggies. Fry them over medium high flame until slightly cooked on the outer. Immediately remove and cool completely. When done refridgerate in air-tight box or ziplock bags for few days. Re-fry them again until golden whenever necessary. Ground Urud dal batter without garnishes and veggies can be refridgerated upto a day.
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Masala Vadai is a popular deep fried snack from Tamil Nadu also known as Paruppu vadai. This is either made with single lentil or combination of lentils. We at home, make it purely with Bengal gram and call it as Masala Vadai and the one made with multiple lentils are termed as Aama Vadai. These vadais with crispy exterior and soft interior can be served as an appetizer, evening snack or in general would suit for any occassion.
Here is a recipe of vadai which is a snack made out of urad dal and channa dal. This vadai comes as soft as urad dal vadai and as crispy as channa dal vadai. 
Easier way to consume for people who don't eat greens.
Nutrituous evening snack.
Best if served in the afternoon,as it takes time to digest if eaten at night time
Served during festival seasons in South India.
Beetroot vadai …yet an other authentic variety of vadai prepared with a unique combination of beetroot and dhals,shaped into vadas and deep fried in oil.This can be had as an evening
snack or with rice as a side dish too.Taste's good with Curd rice and Ghee rice.
U can make Vadais with the corn kernels. I tried it , it was awesome hence wanted to share this recipe wid u all.Hope u will like it
Minced Eral mixed with roasted gram flour (Pottukadalai / Channa / Dalia flour), shaped into little vadais and deep fried. Rare chettinad influenced recipe, perfect appetizer and also a great side for any non -veg meal. (Shrimp Vadai / Prawn Vadai / Royyala Vadai )
English to Tamil, Shrimp / Prawn — Eral.
A crispy and healthy snack.
Home style minced meat vadai made with split roasted gram (Pottukadalai / Dalia / Udaicha Kadalai )