Let the butter warm up in a pan. Add the bacon cubes, fry. Reduce the heat, add the onions, sauté. Add the rice and cook until translucent while stirring. Deglaze with a little bouillon, allow to reduce. Gradually add a little bouillon, cook on a low heat until al dente, stirring frequently.
Pour in the cream, fold in the parmesan and let it get a little hot again.