Heat the oil and 1 tbsp of butter in a pot over medium heat. When the butter is bubbling add the sausage. Cook 2 minutes. Add the onion and cook until softened. Add the garlic, and the rice. Toast, stirring constantly for 1-2 minutes. Add the pepper, paprika, and one cup of the stock. Bring to a simmer and reduce the heat to medium low. Stir the rice frequently and cook until almost all of the liquid has been absorbed. Add another cup of the stock. Continue stirring and cooking down the liquid. Stir in the remaining stock. Cook for 2-4 minutes, then add the manchego and remaining tablespoon of butter. Remove the rice from the heat and spread on a sheet pan to cool.