Rebels of the Red Planet by Charles L. Fontenay

Nuwell Eli sat with Placer Viceroy, director of the Canfell Hydroponic Farm, in its large underground dining room, eating lunch. This meal was not the tasteless, gelatin-like food that was fed to the Jellies and Toughs and sold on the Martian market. It was a meal of thick, juicy steaks from the dome farms around Hesperidum and vegetables from the gardens inside the Mars City dome.

"We've been here better than a week, and she's still stubborn," Nuwell said morosely. "Surely she has the intelligence to realize how ridiculous and impractical is her sudden conversion to a lost rebel cause. I'm half convinced that this Kensington fellow put her under some sort of a hypnotic spell."