First clean the grapes: wash them, remove the berries from the stalks, peel them and cut them in half to eliminate the seeds, then sprinkle them with lemon juice and set aside.
Then prepare the dough: Whip the eggs with the sugar until the mixture is very fluffy.
Then add flour, frumina and yeast, all sifted, interspersed with the yogurt, and work until you get a homogeneous mixture without lumps.
Then add 3/4 of the grapes and mix gently to incorporate them into the mixture.
Pour the mixture into the mold lined with parchment paper, then sprinkle with the 2 additional tablespoons of brown sugar and bake for about 35-40 minutes in a preheated ventilated oven at 180 ° C.
Once out of the oven, let it cool down and decorate with icing sugar: the grape plum cake is ready.
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