12 ounce Evaporated milk
1/2 cup Sugar, granulated
2 tablespoons Butter
2 tablespoons Corn syrup, light
12 ounce Semi-sweet chocolate
2 teaspoons Vanilla extract
Add everything except chocolate and vanilla in small sauce pan.
Bring to boil using medium heat. Cook for 3 minutes stirring constantly.
Remove from heat and add chocolate and vanilla.
Add water to reach desired thickness.