Line a heat-resistant mould (approx. 12 x 22 cm) with a strip of baking paper (approx. 12 x 32 cm) and coat the two long sides of the mould with oil
Put the sugar, cream and butter in a wide, high pot. Cut the vanilla pod lengthwise, scrape out the pulp. Add the vanilla pod and pulp to the pot and bring everything to the boil while stirring occasionally
Hang the sugar thermometer in the pot and let everything boil over medium heat for 30-40 minutes. Do not stir if possible. When the temperature has reached 114-115 °C (sugar mass is slightly thick and beige-brownish/ ball sample in ice water) remove from the heat and remove the vanilla pod
Now stir the caramel mass for 4-5 minutes until it has a creamy, thick consistency. Then immediately pour into the prepared mould and smooth it down. Leave to cool for 4-5 hours. Remove the fudge from the long sides of the mould with a knife and lift it out of the mould using the baking paper. Cut into approx. 2 x 2 cm cubes
waiting time approx. 4 hours