Homemade is best. One large onion and a medium onion. 2 and a half cups Arborrio rice. 2 Tablespoons olive oil. Parmesano Reggiano or a good Parmesan. Bunch of sage. Snip leaves off of stems with fingertips. Add oil oil to medium hot pan, saute large chopped onion. Add rice until translucent. More @Wikipedia
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