In a saucepan, melt 60 ml (¼ cup) of butter. Add the flour and cook for 1 minute, stirring constantly. Add the fruit purée and bring to a boil, stirring with a whisk. Simmer gently for about 30 seconds, stirring constantly.
Pour into a bowl, cover with plastic wrap directly on the mixture and let cool to room temperature.
Add the sugar and the remaining butter and beat with an electric mixer for about 5 minutes or until the frosting is smooth and creamy.
This frosting will keep for about 3 days at room temperature or refrigerated. In the latter case, let cool to room temperture and beat again to restore its smoothness.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.