In the bowl of your stand mixer if using, combine the flour, sugar and salt.

In a small bowl dissolve the yeast and ½ teaspoon sugar in the milk. Cover with a saucer for 10 minutes, or until it starts to foam.

Make a small well in the flour mixture and pour in the yeast. Break the egg over the yeast and sprinkle with lemon zest and vanilla. Distribute the soft butter on the edges.

Using the hook attachment knead on speed 2 until the dough comes together about 5 minutes, and becomes smooth and pliable. Form the dough into a ball and place in a slightly greased bowl. Cover with a clean towel and allow to rest in a warm, quiet place for two hours until double in size.

Cover the bottom of a 32-cm pie dish with parchment paper. Preheat oven (175°C/350°F).

Roll out the dough on a slightly floured surface and transfer to the prepared sheet. Grease the surface of the dough with the one tablespoon melted butter and arrange the plums on it.