Return a function from a function

When you want a function to return a String, it's pretty obvious:

func whatIsForLunch() -> String {
    return "Something delicious"
}

If you want to return a function, then the return type looks more like this: () -> Void. The key bits that trip me up:

• You need { } to assign the function to a variable or constant.
• You need () to use the assigned function

func howToMakeACake() -> (() -> Void) {
   // return some function
}

var cakeRecipe: () -> Void 
cakeRecipe = { howToMakeACake() }  // you need the { }

if timeForCake {
    cakeRecipe()  // you need the () to run the function
}