Grease a tart mould with a removable base or springform pan (26 cm Ø). Knead 200 g flour, icing sugar, 1 pinch of salt, 150 g butter in pieces and egg yolk first with a hand mixer and then briefly with your hands until smooth. Cover and chill for about 1 hour
2. roll out the dough on a little flour until round (approx. 30 cm Ø). Line the mould with the dough, pressing the edges into the grooves. Prick the base several times with a fork, sprinkle with breadcrumbs. Put it in a cold place
Wash plums, remove stalks, quarter them and stone them. Place on the pastry base. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 25 minutes
Heat the jam, pass through a sieve and mix with cinnamon. Spread it on the plums and bake for another 5 minutes. Cool in the tin for about 10 minutes. Remove from the tin and cool down completely. Dust the rim with icing sugar