I regularly eat at Haldiram’s CP & Lajpat nagar when in Delhi.
They have excellent thali menu like ghar ki thali, executive thali, special thali, soutindian platter, these all are very good & I have tried it my self.
The price is also affordable & worth it. Their sweets are also too good. I have tried rasgulla, ras malai, halwa etc.
Not to forget their Chole bhatuer which are very very yummy.
The ambience is very good but you have to stand and eat most of the time as sitting arrnangements at lajpat are very less compared to CP where 1st floor is for sitting only.
They do not take any reservation & its self service only.