Coarsely chop 100 g pecans. Peel bananas and cut into fine slices. Beat the eggs, sugar and oil. Stir in bananas and vanilla pulp briefly.
Mix baking powder, flour, salt and cinnamon. Quickly stir into the egg mixture, stir in buttermilk, fold in chopped pecans. Pour into a greased, sugar-spread box form (1 1/4 litre capacity; 26 cm long). Sprinkle with 50 g pecan nuts
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 1 hour. Remove from the oven and leave to rest in the mould for approx. 15 minutes. Turn out of the mould and dust with icing sugar shortly before serving