Rice is a seed grain native to the planet Earth.
Rice is the primary base for Jambalaya. Ben Sisko has the tendancy to overcook his rice dishes whenever he is frusterated about something. (DS9: "Tears of the Prophets")
Steamed rice was one of the dishes on the menu aboard Enterprise until chef got sick. (ENT: "Singlarity")
Replicator entree 103 is a dish of Curry chicken and rice, with a side of carrots. (DS9: "Blaze of Glory")
In an attempt to explain Spocks ears to a 20th century New York City police officer who had never seen a Vulcan before, Kirk claimed that Spock got them caught in a "mechanical rice picker". (TOS: "The City on the Edge of Forever")