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1
Prepare a very hot fire (650F) in a wood-fired oven or cooker.
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2
Put the 2 tablespoons olive oil in a high-heatproof terra-cotta baking dish or cast-iron skillet.
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3
Add the onions, sausage, and garlic.
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4
Place in the center of the wood-fired oven to cook until the sausage is lightly crisped and the onions and garlic are well caramelized, about 15 minutes.
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5
Remove from the oven and stir in the spinach and red pepper flakes.
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6
Set aside to cool slightly.
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7
When ready to form the dough, flour a baking peel and shape each dough ball into an 8-inch round on the peel.
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8
Lightly brush the dough with olive oil without getting the oil on the peel.
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9
Spread the filling on half of the dough, leaving 3/4 inch on the edge.
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10
Add the mint, then sprinkle with the cheese and pine nuts.
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11
Lightly salt.
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12
Fold the dough over the filling, matching up the edges.
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13
Fold the edges over to further seal and crimp closed with a fork.
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14
Lightly brush the top with olive oil and lightly sprinkle with sea salt.
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15
Let rest for 10 minutes.
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16
Slide the calzones onto the floor of the wood-fired oven, 8 to 10 inches away from the heat source, and bake, turning occasionally for even color, until they are puffed and golden, 10 to 15 minutes.
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17
Let cool for 5 minutes, then cut in half and serve.
