These are Kaylee's strawberries. Shepherd Book gave them to her as partial payment for his passage on Serenity when he boarded in episode 1 of the Firefly series.
These were crocheted from 100% acrylic for Nerd Wars on Ravelry, in the "Big (Nerd) Love" Challenge. The team I made this for is team Browncoat, though I'm on Team Stargate Command. It ties in though, see. Kaylee Frye was played by Jewel Staite, who also played Dr. Jennifer Keller in Stargate Atlantis.