Lid
2 cups (250 grams) all- purpose flour
1/2 teaspoon table salt
13 tablespoons (185 grams or 1 stick plus 5 tablespoons) cold unsalted butter, diced
6 tablespoons (90 grams) sour cream or whole Greek yogurt (i.e., a strained
yogurt)
1 tablespoon (15 ml) white wine vinegar
1/4 cup (60 ml) ice water
1 egg, beaten with 1 tablespoon water, for egg wash

Filling
2 tablespoons (30 ml) olive oil
4 ounces (115 grams or 3/4 to 1 cup) 1/4-inch-diced pancetta
1 large or 2 small onions, finely chopped
1 large carrot, finely chopped
1 large stalk celery, finely chopped
Pinch of red pepper flakes
Salt and freshly ground black pepper
2 garlic cloves, minced
Thinly sliced Swiss chard leaves from an 8- to 10-ounce (225- to 285-gram)
bundle (4 cups); if leaves are very wide, you can halve them lengthwise
3 1/2 tablespoons (50 grams) butter
3 1/2 tablespoons (25 grams) all- purpose flour
3 1/2 cups (765 ml) sodium- free or low- sodium chicken or vegetable broth
2 cups white beans, cooked and drained, or from one and a third 15.5- ounce
(440-gram) cans