Rice is the most widely consumed staple food (especially in Asia), it should be in Minecraft too. Rice seeds can be obtained similarly to obtaining wheat seeds, by destroying grass. But you can only find it in some biomes (for example tropical biome).
You have to plant the rice seeds in water (one block height) and a fully grown rice plant is two blocks high (so it is visible above the water). You can then harvest it and transform the rice into different meals:
- Rice + bowl = Bowl of rice
- Rice + dried kelp + fish = Maki sushi
- Rice + bowl + chicken + carrot = Fried rice
- Rice + Sugar = Mochi (rice cake)
Maybe you could make a bag of rice with nine “pieces” of it.