Here's an explanation that was given in another thread last year, I'm just going to copy and paste it here:
"The tomato flower is made up of several fused ovaries which extend into a fused stigma. When one or several of these ovule's stigmata do not become completely fused with the others they result in side appendages."
Several queries about it appear every year so it's not all that uncommon. Very amusing when it shows up in the garden though!
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