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Fallout Wiki

Well, the stuff is so rare, I only know one. It's called Mississippi Quantum Pie. It's delicious! If you want me to make you one, I can. Just bring me some flour, vodka, and a Nuka-Cola Quantum. I can whip it up in no time.Sierra Petrovita

Mississippi Quantum Pie refers to an unmarked and repeatable quest in Fallout 3.

Quick walkthrough

Unmarked Quest: Mississippi Quantum Pie
Talk to Sierra Petrovita.
Bring her 1 flour, 1 Nuka-Cola Quantum and 1 vodka.
Reward: Mississippi Quantum pie

Detailed walkthrough

After completing The Nuka-Cola Challenge quest, Sierra Petrovita can make Mississippi Quantum pie if you bring her the proper ingredients (ask her about recipes).