Mix urad dal, millet & fenugreek seeds in a bowl & soak it with enough water for at least 1 hours.
Then add green chilli & garlic cloves , grind it & make a paste of it.Don't add water.If needed add 2 to 3tbspn water.We have to make the consistency just like dosa batter.
Add salt, cover it & keep aside for fermentation for at 3 to 4 hour.Don't over ferment else it will become sour.
Chop cucumber, tomato, onion, carrot.Add salt & chat masala.Salad is ready.
Take small hand sandwich maker now.Make it hot on gas & brush oil on both side of it.
Now spread some batter on one side of it & put some salads over it .
Again cover it with some batter & decorate it with some salads.
Make the flame low, sprinkle few drops of oil over it & cook both side in low flame for about 10 to 12 minutes.
Sandwich is ready now.Serve it with tomato sauce or chutney.
Enjoy!!!