2. In the bowl of a stand mixer using the paddle attachment, or in a large mixing bowl using an electric mixer, cream together the butter and sugar until light and fluffy, 3 to 5 minutes.
3. Add the vanilla and water and mix thoroughly. Gradually add the flour and salt, then the pecans. Shape the dough into 1½-inch crescents and place on a greased cookie sheet. Bake until lightly browned, about 8 minutes.
4. Roll the cookies in powdered sugar while still warm, then cool on a rack.