1 sweet tart crust (See recipe below)
2 tablespoons (1/4 stick) butter
3 bunches green onion (white and green parts only), coarsely chopped
1 teaspoon dried thyme
1/2 bunch Green chard, ribs removed, leaves chopped (about 2 1/2 cups)
1 1/4 cups whipping cream (I used 1% milk)
3 large eggs
2 large egg yolks
1 teaspoon salt
1/4 teaspoon ground black pepper
Pinch of ground nutmeg (I used allspice)
Roll out pastry on floured work surface to 12-inch square. Transfer to 9-inch-diameter glass pie dish. Trim overhang to 1 inch. Fold under; crimp edges. Cover; chill.
Melt butter in large nonstick skillet over medium-low heat. Add onions and thyme. Sprinkle with salt and pepper. Cover; cook until onions are very tender but not brown, stirring often, about 10 minutes. Add chard; saute until wilted, about 2 minutes. Remove from heat; cool.
Position rack in bottom third of oven; preheat to 425Â°F. Whisk cream and next 5 ingredients in large bowl. Mix in cooled onion mixture. Pour filling into crust.
Bake tart 15 minutes. Reduce heat to 350Â°F and bake until filling is puffed and just set in center, about 15 minutes longer (this took my oven about 10 minutes longer). Transfer to rack; cool 10 minutes.
Sweet Tart Crust
1 1/4 cups all-purpose flour, plus more for rolling
1/2 teaspoon salt
2 tablespoons sugar
10 tablespoons (1 1/4 sticks) frozen or cold unsalted butter, cut into chunks
3 tablespoons ice water, plus more if necessary
1 egg yolk
1. Combine the flour, salt, and sugar in the container of a food processor and pulse once or twice. Add the butter all at once; process until the mixture is uniform, about 10 seconds (do not over-process). Add the egg and process another few seconds.
2. Put the mixture in a bowl and add 3 tablespoons ice water; mix with your hands until you can form the dough into a ball, adding another tablespoon or 2 of ice water if necessary (if you overdo it and the mixture becomes sodden, add a little more flour). Form into a ball, wrap in plastic, and freeze for 10 minutes or refrigerate for at least 30 minutes). (You can refrigerate for up to a couple of days, freeze for up to a couple of weeks.)
3. Sprinkle a countertop with flour and put the dough on it; sprinkle the top with a little flour. Use a rolling pin to roll with light pressure, from the center out. If the dough is sticky, add a little flour (if it continues to become sticky, and itâ€™s taking you more than a few minutes to roll it out, refrigerate or freeze again). Roll, adding flour and rotating and turning the dough as needed; use ragged edges of dough to repair any tears, adding a drop of water while you press the patch into place.