Mash yams, place in large bowl with chestnuts, crushed pineapple and apples

Melt butter and sugar in saucepan on medium heat until smooth

Add cinnamon and rum, stir until smooth

Add reserved pineapple juice and ginger

Cook until blended and smooth

Pour half of mixture into yams and blend well

Line greased casserole with sliced pineapple.

Add potato mixture and smooth out top to make level

Drizzle on remaining syrup

Bake 350 degree oven for 45 min