In a large bowl, combine the flour, salt, sugar, and active dry yeast. Add the lukewarm water and olive oil, then knead into a soft, elastic dough. If it's too sticky, add a little flour; if it's too dry, add a little water.
Cover the dough and let it rise in a warm place for about 1 hour, or until doubled in size.
Meanwhile, prepare the filling: halve the grapes and remove the seeds if necessary. Roughly chop the walnuts.
Combine the ricotta with the honey and cinnamon until you have a creamy, sweet filling.
Turn the risen dough out onto a floured surface and divide it into four equal pieces. Roll each piece into a circle about 3 mm thick.
Spread the honeyed ricotta on one half of each circle, then sprinkle with the halved grapes and chopped walnuts. Be sure to leave about 1 cm of space around the edges for folding.
Fold the dough over to form a half-moon-shaped calzone. Press the edges firmly together, then use a fork to crimp them closed to prevent them from opening during baking.
Brush the top of the calzones with a beaten egg to give them a golden brown color after baking.
Bake in a preheated oven at 400°F (200°C) for about 20 minutes, or until the calzones are nicely golden brown.
Let cool slightly, then serve fresh, drizzled with extra honey or dusted with a little powdered sugar.
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