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1
For pizza dough, dissolve yeast in 1/4 cup water and let stand 10 minutes.
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2
Combine flour and salt in large bowl.
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3
Make well in center and pour in yeast mixture, remaining water and oil.
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4
Mix with fingers or fork until dough can be gathered into ball.
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5
Transfer to floured board and knead until smooth, shiny and elastic, about 15 minutes.
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6
Cover with plastic wrap and damp cloth and let rise in warm draft-free area until doubled, about 1 1/2 hours.
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7
Preheat oven to 400F (200C).
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8
Punch dough down and divide into 6 equal parts.
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9
Roll out 1 part at a time (keep remaining dough covered with damp cloth) into 10-inch round.
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10
Spread 1 tablespoon pizza sauce over half circle and sprinkle with 1/6 of the cheese and mushrooms.
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11
Lay a small amount of peppers, onions and olives on.
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12
Cover with 2 squares ham and season with salt and pepper.
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13
Fold turnover fashion and pinch edges together to close.
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14
Repeat for each calzone.
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15
Bake directly on oven racks until nicely browned, about 8 to 10 minutes.
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16
Brush each hot calzone with remaining pizza sauce and a few drops of olive oil.
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17
Sprinkle with oregano and serve immediately.
