Ooba-Doa was the unseen robot chef in the Doctor's TARDIS when the Fifth Doctor travelled with Tegan Jovanka and Vislor Turlough, and was still present when Peri Brown travelled with the Sixth Doctor.
He prepared all meals in the TARDIS, both simple and elaborate. If he ever furtively used the gold, silver, and tinclavic from the TARDIS workshops when cooking, he was far too discreet to advertise the fact. (PROSE: Resurrection of the Daleks)
The Sixth Doctor claimed he could "make food that tastes as if it came directly from paradise." (PROSE: Revelation of the Daleks)