Proceed as for making sablé dough. Roll to a thickness of 4 on the roller. Cut out 4 cm circles and bake at 165°C (329°F) for 15 to 20 min. Reserve.
Heat the Panna Cotta to 80°C (176°F). Pour into verrines and chill to set.
In a bain marie, cook the raspberries with the sugar. Strain to recuperate the nectar. Reduce and incorporate the dissolved gelatine. Refrigerate.
Fill verrines to 3⁄4 full with the Panna Cotta. Cut out a disc of dacquoise* smaller than the diameter of the verrine. Coat the edge of the dacquoise with the nectar. Fill the centre with the red berry jam**. Top with a Breton sablé and a disc of white chocolate.
*Prepare one 40 x 60 cm sheet. Cut out 4 cm circles
**500 g of red berry jam and raspberries