Heat the milk, cream, and invert sugar to 175°F (80°C).
Gradually pour it onto the partially melted chocolate, emulsifying it with a spatula as you do so.
Blend as soon as possible until you have a perfect emulsion.
Pour into a tray, seal the surface with plastic wrap, and allow to crystallize ideally for 12 hours at
40°F (4°C) before use.
To fill a tart crust, pour in the ganache at around 85°F (30°C).
Leave the tarts to set at room temperature.
Keep refrigerated.
For macarons, pipe the crystallized ganache inside, then set aside in the refrigerator for
1/2 hours before freezing.
Defrost at 40°F (4°C).