To make the yeast dough, heat the milk in a pan until lukewarm. Add the sugar, yeast, and salt and stir everything well. Put the flour and oil into a bowl. Add the milk mixture and use the dough hook attachment on an electric mixer to process everything for a few minutes, until you have a glossy, supple dough. Cover with a tea towel and leave to prove in a warm place for 1 hour, until doubled in volume.
Meanwhile, set aside a few of the berries for decorating. Line a tray with baking parchment and preheat the oven to 200°C/ Fan 180°C/Gas 6). Knead the yeast dough once again on a floured work surface and roll it out to create a circle (diameter 28cm/11in), shaping the edges to come up slightly higher.
Lay the dough on a baking tray, spread ricotta evenly over the surface, and top with a densely packed layer of berries. Drizzle with honey and scatter over the pine nuts. Bake the pizza in the centre of the oven for 20–23 minutes. Remove from the oven and scatter over the mint leaves and reserved berries.