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1
In a large bowl, mix together flour, salt, and yeast. Add water and olive oil and mix until fully incorporated. Continue mixing and kneading until a smooth, elastic dough forms, about 5 minutes. Grease a medium bowl with olive oil. Stretch dough ball by tucking it under itself to form a taut, smooth ball. Drizzle with olive oil, rub to coat, and transfer to greased bowl. Cover with plastic and set aside in a warm place until doubled in size, about 2 hours.
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2
In a large saute pan, heat oil over medium-high heat until shimmering. Add green peppers and cook, stirring occasionally, until just starting to soften, about 5 minutes. Add onions and garlic and cook, stirring occasionally, until onions and green peppers are very soft and sweet, about 25 minutes; lower heat as necessary to prevent burning. Stir in tuna, season with salt, and set aside.
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3
Preheat oven to 350u00b0F. Grease a large rectangular or circular rimmed baking dish or large cast iron skillet with olive oil. Divide dough into 2 portions, one twice as large as the other. On a floured work surface, roll out larger dough to form a thin sheet. Transfer rolled-out dough to the greased baking dish, pressing it into corners and allowing dough to overhang rim, trimming off any excess.
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4
Scrape filling into baking dish, smoothing it in an even, flat layer.
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5
Roll out smaller portion of dough to form a thin sheet. Transfer to baking dish, arranging it to cover filling in an even layer. Roll overhanging dough of bottom crust onto top crust, twisting to seal.
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6
Cut a small hole in center of top crust to form steam vent. Using a piece of dough trimmings, form a small decorative ring for steam vent. Transfer to oven and bake until browned on top and cooked through, 45-55 minutes (setting baking dish or skillet on a preheated baking stone or bottom of oven for about half of the cooking time will help crisp and brown the bottom crust).
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7
Remove from oven and let cool slightly. Cut into wedges (if pie is circular) or squares (if pie is rectangular) and serve warm or at room temperature.
