We make the caramel with sweetened condensed milk. We boil the can in a large pot for about 4 to 5 hours over a low heat. The can needs to be completely submerged, so check regularly if you have enough water in the pot and add more water if needed.
Soak the gelatin in cold water.
Heat up the heavy cream, making sure not to let it boil. When the cream has warmed up, add the gelatin and allow it to dissolve. Add roughly 1 ¾ oz (50g) of caramel. Stir gently to combine.
Divide equally between 3 glasses and refrigerate for at least 3 hours.
When ready to serve, sprinkle chopped toasted hazelnuts on top and drizzle with caramel.