Chorizo: use a knife and cutting board to thinly slice the chorizo into pieces. Once done place a large non stick sauté pan on the stove top, turn the heat to high and cook the chorizo for 2-3 minutes using a wooden spoon to rotate and stir as you go. Once the chorizo is cooked and looking a little charred and browned on the surface, transfer it out of the pan and onto a paper towel lined bowl.
Prawns: prepare the prawns by using a cutting board and starting by twisting their heads off. Then peel the shell and legs, leaving the tail and end segment intact. Next use a knife and cut along the backbone of the prawns and remove the digestive tract. Repeat for all of the prawns.
Cook prawns: without rinsing or cleaning the pan that the chorizo was cooked in add the prawns, salt and pepper. Cook the prawns for 3-4 minutes until they have turned bright orange with white flesh and their is no translucent skin. Once they are cooked, transfer them to the plate with the cooked chorizo.
Flavor base: again without rinsing or cleaning the pan add the butter, olive oil and garlic. Cook this stirring as you go for 1 minute. Then add the diced onion and stir to combine.
White, rice and stock: once the onion has had a chance to cook (1 minute or so), add the white wine followed by the rice. Use the wooden spoon to stir the pan contents until the rice separates slightly and mixes in with the butter and oil mixture. Once it has gradually pour in the stock, stirring as you go and not adding more until the stock in the pan has somewhat absorbed.
Cheese and spinach: when the rice mixture has thickened slightly add the parmesan cheese and give it a stir. Then add the spinach and allow it to soften and wilt into the pan.
Chorizo and prawns: next add the cooked chorizo and prawns back to the pan then gently stir folding these in and allowing them to heat through.
Garnish: once the dish is consistently mixed in and heated through liberally garnish it with black pepper and parmesan cheese.
To serve: provide bowls and spoons for serving then portion and serve.