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Heat chicken stock in a separate pot and keep at a gentle simmer throughout cooking.
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Heat olive oil and butter together in a large, heavy-bottomed pot over medium heat.
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Add diced onion and minced garlic. Cook, stirring often, until softened and fragrant.
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Add Arborio rice and toast for 1-2 minutes, stirring constantly.
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Add white wine if using and stir until absorbed. If no wine, proceed directly to adding stock.
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Add warm stock, one ladle at a time. Stir frequently and wait until liquid is absorbed before adding more.
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Continue adding stock and stirring for 18-20 minutes until rice is creamy and al dente.
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Fold in fresh peas and diced prosciutto about 2 minutes before rice is finished cooking.
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Remove from heat and stir in butter, Parmesan cheese, and fresh parsley.
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Season with salt and white pepper. The risotto should be creamy and flow slightly on the plate.
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Serve immediately in warm bowls. Risotto doesn't hold well; serve right after making.
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Garnish with fresh spring herbs, extra Parmesan, and lemon zest if desired.