In a large saucepan, over medium high heat, bring 7-8 cups of chicken broth to boil, reduce to simmer to keep warm.I like to use Better Than Boullion, which I always keep on hand for cooking.
In another large saucepan or skillet, melt butter & oil, add diced onions and sprinkle lightly with one teaspoon of salt to bring out sweetness. Sauté over low heat, do not brown, until lightly translucent. Add rice and stir with wooden spatula for 1 minute. Add tomato paste and stir to coat rice and bring out flavor.
Begin adding one ladle of broth, enough to cover, stir through with spatula and let it simmer slowly until nearly absorbed (about 2-3 Minutes). Repeat the process until all but one ladle is absorbed. This process “develops patience!” Rice should be soft to bite, moist and creamy. Turn off heat and add the last ladle of broth and cheese, gently stir. Often served with extra cheese!