Spread the bottom of a springform pan (24 cm Ø) thinly with oil. Melt butter. Finely chop 50 g walnuts. Finely crumble the lady fingers (see tip on page 14). Mix sponge crumbs, chopped walnuts, sugar and liquid butter well.
Pour the crumb mixture onto the bottom of the springform pan and press it down to an even base. Cover and chill for about 20 minutes.
Preheat oven (electric cooker: 150 °C/circulating air: 125 °C/gas: see manufacturer). Stir cream cheese and 125 g caramel spread with the whisks of the mixer until smooth. First stir in eggs, then starch. Pour cream onto the crumb base.
Bake in the hot oven on the second rack from below for about 50 minutes.
Turn off the oven, half-open the door and let the cheesecake cool in the oven. Take it out and let it cool down completely on a cake rack.
Spread 125-175 g caramel spread on the cake and chill for 3-4 hours, preferably overnight. Coarsely chop 25 g walnuts. Remove the cheesecake from the tin and sprinkle with walnuts.