Chocolate Sauce - cooking recipe

Ingredients

1 c. sugar
1/3 c. cocoa
1 Tbsp. cornstarch
1 c. boiling water
butter (the size of an egg)
1 tsp. vanilla
1/2 tsp. salt

Preparation

Cook sugar, cocoa, cornstarch and water until bubbly and thick.
Remove from heat and add butter and vanilla.
I don't add salt, but you may.