An Orange is a fruit of the citrus species from Orange juice can be made. in 2006, Richard P. Woolsey ate an orange from the Atlantis mess hall. (SGA: "Misbegotten")
In 2007, Dr. Carson Beckett grabbed an orange from the mess hall for his fishing trip. (SGA: "Sunday")
Teal'c is known to eat oranges. (SG1: "Redemption, Part 1")
Woolsey having peeled his orange.