Melt 80 g butter and let it cool down a little. Preheat the oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Grease an ovenproof dish (approx. 24 cm Ø).
Mix flour, ground almonds, sugar and 1 teaspoon cinnamon. Whisk eggs, milk and liquid butter. Mix milk and flour mixture. Peel, quarter, core, dice and fold in pears. Fill into the mould, sprinkle with almonds.
Bake in a hot oven for 40-45 minutes. Dust with icing sugar. Tastes best warm, for example with cream or vanilla ice cream.