Hi

There are many good Indian restaurants here in Doha. You can find both veg and non-veg dishes in these restaurants. Few of them are:
1 Garden Restaurant- upstairs u can find north indian dishes.

2 Swagat- at Najma. Here also the food is good and at reasonable rates.

3 Mazza- at airport road

4 Asiana- at airport road

5 Prestige-at airport road

All the above mentioned restaurants are good and resonable too. But as far as I know there are no home made tiffin systems here in doha.