The ornamental design for a spoonsifter, as shown.
FIG. 1 is a perspective view of a spoon sifter showing my new design;
FIG. 2 is an exploded view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof, the left side being a mirror image;
FIG. 5 is a front end view thereof;
FIG. 6 is a rear end view thereof; and,
FIG. 7 is a bottom view thereof.
The hole in the handle shown in broken lines in FIGS. 1-3 and 7 and the screen shown in the bowl in broken lines in FIGS. 1-7 are not part of the design.