The easiest tiffin i can ever think of is rava dosa. No grinding required and the only time i spend is making the dosas. It can be served with any chutney of choice or with just idli podi too..
Sooji - 1 cup
Rice flour - 3/4 cup
Maida - 3/4 cup
Ginger chopped fine
Dry chilies - 2 for tadka
Coconut - chopped 1 tbsp
Saute all the above in a little gingelly oil and let it cool.
Mix all the three flours in water with salt and it should be very watery. Set it aside for an hour.
Mix in the sauted and cooled ingredients and make sure there are no lumps.
Heat the tava and hold it in a slanting position to pour the batter. This batter cannot be flattened with a spoon like dosa batter. Do no t pour too much batter otherwise it will become thick.
Let it cook completely on one side before turning it over, it will turn golden brown.
Serve it hot.