Preheat your oven to 400°F (200°C). If using store-bought pizza dough, let it rest at room temperature for 10 minutes to make it easier to roll out.
On a lightly floured surface, roll out the pizza dough to about 1/8 inch (3-4 mm) thickness. Shape it into a large circle and cut it into two equal halves.
Peel the beetroot and slice it thinly or grate it for even cooking.
Heat the olive oil in a skillet over medium heat. Sauté the beetroot for 5-6 minutes, until slightly softened.
Add the finely chopped garlic and sauté for another minute, then drizzle with balsamic vinegar.
Roughly chop the walnuts and toast them in a dry skillet over medium heat for 2-3 minutes, until fragrant.
Combine the ricotta and mozzarella cheese with the toasted walnuts and freshly chopped rosemary. Add the beetroot mixture.
Place the filling on one half of the dough, then fold the other half over it. Use a fork to press the edges together, sealing the calzone.
In a small bowl, whisk the egg and brush it over the top of the calzone for a golden-brown finish.
Place the calzone on a baking sheet lined with parchment paper and bake for 15-18 minutes, or until golden brown.
After baking, let it cool slightly, then drizzle with a little balsamic vinegar and serve warm.
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