Mash the strawberries and mix with half the ice cream. Spread the mixture in the chosen mold, with plastic wrap on the base, and freeze for 1 hour.
Mash the blueberries and mix with the other half of ice cream. Pour the mixture over the frozen strawberry base and put back in the freezer until completely firm.
To serve, take out 5 minutes in advance, unmold, and decorate with fresh strawberries and blueberries.
