Butterscotch Pie

Melt 6 Tbls oleo
Add 1 c brown sugar
Boil until foamy (2 or 3 min)
Stir in 1 c boiling water
Remove from heat
Mix in the sauce pan:
3 Tbls cornstarch
2 Tbls flour
1/2 tsp salt

Stir in gradually 1 2/3 c milk.
Stir in brown sugar mixture.
Cook over low heat until boiling.
Boil 1 minute. 
Stir a little into 3 egg yolks slightly beaten.
Blend into hot mixture- boil 1 minute longer
Remove from heat.
Add 1 tsp vanilla.