Mix flour and baking powder. Knead with cold fat in pieces, egg yolk, ground almonds, espresso and 45 g diabetic sweetener first with a hand mixer, then with your hands until smooth. Chill for about 1 hour
Divide the dough into thirds and form 3 rolls (each approx. 2 cm Ø). Cut each roll into 16 slices (approx. 2 cm thick) and form into croissants. Place on 2 baking trays lined with baking paper and bake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3) for 10-12 minutes. Let them cool down
Finely chop the nuts. Break chocolate into pieces, melt with fat in a hot water bath while stirring. Dip the croissant into the chocolate with the convex side or the tips. Sprinkle with chopped nuts and 3 g diabetic sweetener. Allow to dry