Roasted Asparagus With Feta

5 pounds asparagus, trimmed, cut into 2-inch pieces (14 to 15 cups) 4 cups chopped leeks (white and pale green parts only; about 4 large) 1/4 cup olive oil 6[...]

1/3 cup minced shallots (about 2 large) 2 tablespoons fresh lemon juice 2 tablespoons Sherry wine vinegar 2 teaspoons grated lemon peel 1 1/2 teaspoons Dijon[...]