I made this mini-burger out of different colors of wool sweaters that I felted in the washer. I sewed all the different pieces first, with beige embroidery floss. Then I put a few stitched through the whole thing, starting at the bottom of the top bun, going through everything to the top of the bottom bun piece. That way, all of the individual pieces don't get lost.
This slider is about 3 inches tall and 2 inches wide.