Toast the sesame seeds in a dry pan over medium heat while stirring for 5 minutes until golden. Remove from the stove immediately and let cool down briefly.
Puree with lemon juice in a lightning chopper or mixer to a slightly lumpy mass. Pour honey into a saucepan, slit open the vanilla pod and scrape out the pulp, mix with the honey, heat carefully. Mix with the sesame puree, heat while stirring until the mixture becomes sticky. Oil a shallow bowl and immediately pour in the hot sesame paste, press it down and smooth it out.
Let cool for about 1 hour. To serve, cut into small cubes with an oiled knife and place in paper cases. Serve as dessert or with coffee.