Pineapple Upside Down Cake - Cast Iron Skillet

¼ cup butter 

½ cup brown sugar 

2 Tablespoons pineapple juice 

1 box yellow cake mix 

1 can pineapple rings

1 maraschino cherry 

Melt butter in a cast iron skillet over low heat. Add brown sugar and pineapple juice and cook slowly until sugar is dissolved. Add slices of pineapple to sugar mixture and place cherry in the center of the ring. In separate bowl, follow the directions to make cake mix. Pour batter over pineapple slices. Bake at 350 for 30 to 40 minutes or until toothpick inserted into center of cake comes out clean. Cool for 5 minutes. Loosen the cake, cover with a plate and invert onto a plate.