Brigadeiro

3 tsp. unsweetened cocoa
1 tsp. butter
1 (14 oz.) can sweetened condensed milk
Chocolate jimmies (optional)

In a medium saucepan over medium heat, combine cocoa, butter, and sweetened condensed milk. Cook, stirring, until thickened, about 10 minutes. Remove from heat and let rest until cool enough to handle. Form into small balls. If desired, you can roll ball in chocolate jimmies. Eat at once or chill until serves.