Hersheys Cocoa Fudge Frosting

3 c sugar
2/3 c Hersheys cocoa
1/8 T salt
1/4 c butter
1 1/2 c milk
1 t vanilla extract

Mix sugar cocoa & salt in heavy 4 qt sauce pan
Stir in milk
Cook over medium heat stirring constantly until mixture comes to boil
Boil without stirring until mixture is 234 F
Remove from heat
Add butter and vanilla
Do NOT stir

Pour over cake
Do not double recipe