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1
Place the stock in a large saucepan and bring to the boil over a high heat; reduce heat and keep at simmering point.
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2
Place a large heavy-based saucepan over a medium heat and add the olive oil, onion, salt, and half the butter; stir until the onions are translucent, add the rice and stir for 1 to 2 minutes, or until the rice is well coated.
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3
Gradually add all the simmering stock, a cupful at a time, stirring constantly and making sure the stock is absorbed before you add more; this should take 20 minutes and the rice should be al dente and creamy.
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4
Remove the saucepan from the heat, and then stir in the remaining butter, lemon zest, lemon juice and pepper to taste; cover the saucepan and let sit for 3 minutes for the flavours to develop.
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5
Meanwhile, pound the chilli and garlic in a mortar and pestle; place the extra olive oil in a frying pan over a high heat and heat until hot.
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6
Season the prawns with salt and pepper, cook for 2 minutes, shaking the pan, until the prawns are just opaque then add the chilli and garlic and cook for 1 minute; remove from the heat and set aside.
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7
Stir the risotto and divide between four bowls; toss the prawns with the parsley then place on top of the risotto, serve with lemon wedges.