Prepare a yeast dough and let it rise for about 40 minutes.
Coarsely chop hazelnuts and walnuts. Roast in a tarte tatin dish without fat and remove. Lightly caramelise 150 g sugar and 2 tbsp water in the mould. Deglaze with cream, stir in 50 g butter.
Let simmer until the sugar is completely dissolved. Stir in the nuts.
Knead the dough briefly on a little flour. Form into a roll (5-6 cm Ø). Divide into approx. 15 pieces of the same size, form each into 1 ball. Place them close together on the caramel nuts. Cover and leave to rise for about 30 minutes.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Bake in the hot oven for about 20 minutes. First let them cool in the tin for about 15 minutes and then turn out onto a plate.
Pour the rest of the caramel from the mould onto the cakes. Taste hot and cold.