Rice was a seed grain native to the planet Earth.
Rice was the primary base for jambalaya. Benjamin Sisko had a tendency to overcook his rice dishes whenever he was frustrated about something. (DS9: "Tears of the Prophets")
Steamed rice was one of the dishes on the menu aboard Enterprise NX-01 in August 2152 until Chef got sick. (ENT: "Singularity")
Replicator entree 103 was a dish of curry chicken and rice, with a side of carrots. (DS9: "Blaze of Glory")
In an attempt to explain Spock's 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")
While trapped in an Akritirian prison in 2373, Tom Paris fantasized about a meal of crown roast of lamb with wild rice and a 2296 Château Lafite Rothschild. (VOY: "The Chute")
At the wedding of the biomimetic duplicates of B'Elanna Torres and Tom Paris, those attending threw rice over the couple as per certain Earth customs. Neelix was perplexed that the rice was not meant to be cooked. (VOY: "Course: Oblivion")