Heat juice in med. pan
Mix corn starch & sugar together & pour into warm juice.
Stir constantly & bring to boil.
Boil until juice is thick & clear.
Remove from heat.
Beat egg yolks until thick & creamy.
Add 3 or 4 tbsp. of hot juice to yolks (keeps yolks from cooking) stir and return juice & yolks to pan.
Bring back to boil until thick.
Cool juice completely or will melt marshmallows.
Add drained pineapple, nuts, marshmallows, & juice mixture together & refrigerate.
Makes enough for 15 to 20.