Wash and clean the strawberries and weigh 250 g. Cut the vanilla pod lengthwise and scrape out the pulp with the back of a knife, use the pod for other purposes.
Puree the strawberries, vanilla pulp and jam sugar for at least 45 seconds with a hand blender.
Pour into two sufficiently large glasses and chill.
Wash basil, shake dry, pluck leaves from the stalks and chop. Mix cream cheese and basil. Halve the rolls and spread with cheese and jam. Chill the rest of the jam and consume within 14 days.