Oh that's cool!! Looks like it's just a petal tip piped with a VERY steady hand and a good smooth turntable.
This look can also be accomplished by icing the entire cake smooth and using the tip of a round end spatula and a turntable to create the grooves.
Thanks... turning the turn table is going to be the challenge I think since I do not have a motorized one!
You need to practise. Because whether you do this with an icing bag or a spatula, you have to turn with one hand and pipe/ice with the other hand. It's as important to turn smoothly as it is to pipe smoothly.
But either way, you can stop and start overlapping the marks.
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