Hot Fudge Sauce

I got this recipe from my mother (no idea where she got it). It's amazing with ice cream, and one friend likes to dip biscotti in it.

Ingredients:

2/3 C cocoa
2 C sugar
1 can evaporated milk
1 stick butter
1 t vanilla

Directions:

• Mix the cocoa and sugar together.
• In a saucepan, melt the butter over low heat.
• Add the evaporated milk and cocoa/sugar mixture.
• Cook, stirring constantly until the sauce comes just to the boil
• Remove from heat.
• Stir in the vanilla.
• Let cool slightly before pouring into mason jars.
• Keep refrigerated; use within a week or so.