Soak the currants in rum for a nice taste
Let the dough rise at room temperature, if the temperature is too warm it will rise too quickly and the batter will form too many bubbles, if the temperature is too low the dough will rise too little
Use golden renettes apples for oliebollen. These are nice and firm and sour and give the oliebol a fresh taste.
The batter is very sticky, so use 2 spoons moistened with water to slide the batter into the oil.
How do you store oliebollen? Store oliebollen in a sealed bag or box for a maximum of 3 days or freeze them (maximum 2 months). Reheat them (after thawing) in the oven for a few minutes.