Method:
1 Preheat oven to 220°C fan-forced. Line a baking tray with baking paper.
2 Combine 200ml warm water, yeast, salt and sugar in a jug. Stir with a fork. Cover and stand for 3 minutes or until bubbles appear on surface. Sift flour into a large bowl. Add yeast mixture and oil and mix to form a soft dough.
3 Turn dough out onto a lightly floured surface. Knead for 5 minutes or until elastic. Cut into quarters. Roll each piece out to an 18cm (diameter) round. Brush edges with water.
4 Combine grapes, rosemary and sugar in a bowl.
5 Spoon ¼ of the grape mixture onto one round of dough, fold over edge, crimp edges to seal. Place onto prepared tray. Repeat with remaining dough and filling. Bake for 10-12 minutes or until calzones are golden. Serve topped with ice cream