3 asparagus tart savory Recipes

all-purpose flour, salt, cold unsalted butter, cut into 1/2-inch cubes, egg, lightly beaten, leek , quartered lengthwise, then cut crosswise into 1/3-inch pieces (white and pale green parts only), asparagus, trimmed, unsalted butter, salt, black pepper, heavy cream, eggs, chopped fresh tarragon

store-bought pie crust, all-purpose flour (for surface), asparagus (about 1 1/4 lb total), trimmed, peeled if thick, spring onions or 12 scallions, olive oil, divided, kosher salt and freshly ground black pepper, unsalted butter, soft fresh goat cheese, creme fraiche, heavy cream, minced flat-leaf parsley, minced fresh chives, minced fresh tarragon, eggs