Nothing beats Chokhi Dhani. It is not exactly in Jaipur. It is located roughly arnd 20 kms from Jaipur on Tonk road.
Oh man, I still remember that amazing food with endless amount of desi ghee, which they literally pour into your food.
For Veg food Chokhi Dhani for Dinner, In case you want to eat Dal Bati & Choorma then either go to Hotel Neelam(near Ganpati Plaza) or Hotel Rawat (near Polovictory Cinema hall).
If you are looking for some rajasthani non veg go for Lal Maans & Junglee Maans along with Mans ka Soola at Spice court, Jacob Road, Civil Lines. Also try their Keema Bati. (Waiting time of half an Hour at this place.)