Soak gelatine in cold water. Heat milk. Mix eggs, egg yolk and syrup in a bowl. Whip until thick and creamy in a hot water bath, then gradually add hot milk. Continue stirring slowly until the cream thickens slightly. Squeeze the gelatine and dissolve in the hot cream. Place in a cold water bath and allow to cool, stirring frequently.
Whip the cream until stiff and fold into the cold elderberry cream. Pour into eight glasses (each containing approx. 200 ml) and chill for at least 3 hours.
Defrost the strawberries. Mix with sugar and puree finely with a hand blender. Serve with elderberry cream.