Fold a stable rail (approx. 40 cm long) out of aluminium foil. Grease half of the grease pan (approx. 16 x 39 cm) and limit it with the rail. Cut pear halves in half and sprinkle with lemon juice immediately. Coarsely chop the nuts. Cream fat, diabetic sweetener, salt and lemon peel.
Stir in eggs one by one. Mix flour and baking powder, alternating with the milk. Fold in 50 g nuts. Spread the dough on the fat pan. Spread pears on top. Sprinkle with remaining nuts. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 30 minutes. Chop the chocolate and fill into a freezer bag. Melt in hot water. Cut off a small corner.
Sprinkle with remaining nuts. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 30 minutes. Chop the chocolate and fill into a freezer bag. Melt in hot water. Cut off a small corner. Cut the cake into pieces and decorate with chocolate strips. Let dry