Preheat oven (electric cooker: 100 °C/circulating air: 75 °C/gas: see manufacturer). Cut the vanilla pod lengthwise and scrape out the pulp. Boil up the pod and pulp with milk, cream and 100 g sugar in a pot.
Remove the pod.
Mix the egg yolks in a bowl. Stir in hot vanilla milk in a thin stream. First pass through a fine sieve, then distribute into four to six ovenproof moulds (each containing approx. 200 ml).
Cook in a hot oven for approx. 1 1⁄4 hours. Take out, let it cool down, cover and put in a cool place for at least 4 hours.
To serve, mix 6 tablespoons of sugar with cinnamon. Spread over the vanilla creams. Caramelise with the kitchen gas burner, swinging the flame slightly back and forth at a slight distance so that the sugar does not burn.