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Brick stock to a low simmer in a medium pot.
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Heat the oil in a saucepan over medium heat for 1 minute.
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Cook onion til translucent (~3 min). Add rice and a pinch of salt.
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Saute until rice is translucent (~2 min).
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Add wine and saffron, and bring to a simmer, while stirring, until most of the wine is absorbed.
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Add 2 ladles of stock to the rice; simmer, stirring, until stock is mostly absorbed.
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Continue adding stock, allowing rice to absorb it before adding the next ladelful.
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Cook until rice is al dente and mixture is a little loose.
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Stir in butter.
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Turn off heat.
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Stir in grated cheese.
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Cover, let sit for 2 minutes.
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Divide among 4 bowls. Garnish with cheese shavings, if you'd like.