Melt about 3-4 tablespoon of butter, let it cool.
Preheat the oven to 180°C.
Mix the rice with the cream and the cooled butter. Let it rest for 10 minutes.
In another bowl, mix the flour with the sugar, baking powder, salt, nutmeg and lemon zest.
Beat the egg in a small bowl with the milk and vanilla extract, then combine this with the rice mixture. Fold in the raisins, followed by the flour mixture.
Spoon the batter into silicone muffin cases or into a lined muffin tin. Sprinkle some almond flakes on top of each muffin.
Bake for about 20-25 minutes until golden, then let them cool completely on a wire rack