Put flour, almonds, 75 g sugar and butter in flakes into a mixing bowl and knead into crumbles with the dough hooks of the hand mixer.
Remove the grapes from the vine, wash and drain. Mix the grapes, 25 g sugar and port wine and pour into an ovenproof dish (800 ml, 20 cm Ø). Spread crumbles on top and bake in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) bake for about 25 minutes. Take out and dust with cocoa.