1Put the rice in a pan that can be used for the oven.
2Add the wine and rum and leave to stand for three hours.
3Put the pan into the fire and boil the rice wine for 15 minutes.
4Then add the grated onion, season with salt and pepper and add the bechamel sauce, butter and cheese with it.
5Stir well, and place in the oven, pre-heated to 235 ° C for 15 minutes.
6Remove from oven and serve.