Dirty(ish) Banana cocktail

Name: Dirty(ish) Banana cocktail
Prep time: 5 min
Cook time: 5 min
Total time: 5 min
Yield: 1 cocktail
Cuisine: Cocktail
Ingredients: 1 dash Angostura bitters; 1 ⁄2 fresh Banana; 4.5 cl Cachaça; 3 cl Grädde; 3 cl Kahlúa