Pineapple Upside Down Cake

1 cube butter or margarine

1 cup brown sugar

1 20-oz can pineapple rings (reserve juice)

marachino cherries

1 yellow cake mix

Melt butter in 9 x 13 pan, add brown sugar and stir.  Arrange pineapple rings on bottom of pan.  Place cherry in center of each ring.  Mix cake according to package directions, except use pineapple juice for the liquid, adding water if necessary to get the right amount.  Pour batter over pineapple.  Bake 350 degrees 40-45 minutes.  When done, let cool for a few minutes and turn cake onto large platter.