I know exactly what you mean, Sue, as I have an old magazine with a project including this technique (I have a feeling it was by Jane Gill, but I may be imagining that).
The magazine will require a bit of rooting out, if you bear with me.
I have a feeling that you need to punch out hearts in several sizes and then shape them using a double ended embossing tool before gluing together.
Try googling "floral punch craft" and you might turn up something useful.
Welcome to UKS, by the way.
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