How to Make It
Preheat the oven to 375°. In a food processor, pulse the flour with the baking powder and 11/2 teaspoons of salt. Add the butter and pulse until the mixture resembles small peas. With the machine on, add the ice water and process just until the dough comes together.
Transfer the dough to a lightly floured work surface and pat it into a 1-inch-thick rectangle. Roll out the dough to a 10-by-12-inch rectangle about 1/4 inch thick. Cut the dough crosswise into 1/4-inch-thick strips.
Gently roll each strip into a 14-inch-long stick. Brush 1 stick with water and twist it with another stick, pressing at the top and the bottom. Arrange the twists on a baking sheet. Repeat with the remaining sticks.
Brush the twists with olive oil and sprinkle with salt. Bake for about 25 minutes, until golden. Let cool before serving.
To make flavored breadstick twists, add 2 tablespoons of fennel seeds, 2 teaspoons of smoked sweet paprika or 2 teaspoons of curry powder to the flour.