In a bowl, combine all-purpose flour, extra-virgin olive oil, cold water, and coarse salt. Stir with a fork to combine, then turn out onto a work surface and knead 1 minute. Cover dough with plastic wrap and let rest at room temperature, 30 minutes.
In a large pot, heat oil over medium-high. Add onion and garlic; cook until onion begins to soften, about 2 minutes. Add chard stems and red-pepper flakes; cook until stems begin to soften, about 2 minutes.
Pack chard leaves into pot; season with salt and pepper. Reduce heat to medium, cover, and cook until chard leaves wilt, about 4 minutes. Uncover and cook, stirring occasionally, until chard is soft, about 4 minutes. Drain, pressing out as much liquid as possible. Place chard mixture in a large bowl and toss with Parmesan, flour, lemon zest and juice. Season with salt and pepper.
Roll two-thirds the dough to a 12 1/2-inch round; fit into an 8-inch round cake pan (2 inches deep). Fill bottom crust with chard mixture. Roll remaining dough to a 9 1/2-inch round; place over filling. Pinch edges of dough together and tuck in to seal; cut several vents into center of pie. Combine yolk with 1 teaspoon water and brush over dough, avoiding edge of pan. Freeze pie (see below).
To serve, preheat oven to 400, with rack in lowest position. Bake frozen pie until crust is deep golden brown, about 1 1/2 hours. Serve warm or at room temperature.
Not so good. My husband covered his serving in hot sauce to get it down. I'll not be making this again.
The pie looked beautiful! I couldn't wait to eat it. The only problem was all I could taste was lemon, a little bit of hot pepper flakes and slight crust flavor. I put the grated zest of 1 lemon and 1 tbs fresh lemon juice as the recipe called for. It was so overpowering you could not taste the swiss chard, onions, garlic, or parmesan at all. I will definitely make this again, just without the lemon.
This was yummy and surprisingly sweet. The cheddar cheese suggested by a previous commenter does work well with it. I made one normal-sized pie and one mini-pie in a souffle dish.
This pie can only be made better by a slice of sharp cheddar cheese on top.
This pie can only be made better by a slice of sharp cheddar cheese on top.