The Easy Hack To Fill Donuts With Jelly At Home - Tasting Table
Briefly

Expert bakers like Zac Young recommend using a sharp knife or chopstick to create a hole in the donut for easier filling with jelly or other fillings using a disposable piping bag. They advise to be cautious when cutting the piping bag, as you can always cut more but never uncut it. In addition to these filling techniques, readers can also find various flavor inspirations and recipes, including fun ideas like raspberry-filled donuts and pumpkin pie filling.
"I use a sharp paring knife or chopstick to poke into the center of the donut, then fill a disposable piping bag with your desired filling and cut the very tip of the bag."
"You can always cut the bag more, you can never uncut it," he advised. Be sure to keep that in mind so that you don't end up having to start the process over.
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