The most common form is oval-ish, however, I have had shapes varying from oval to blunt hearts to what looked like a beefsteak... On the same plant.
My seeds are from Nikitovka and I grew them on different years, and weather definitely makes these differences in shape.
Last year, I had one huge heart in the cold and rainy weather, before I took in indoors before it might rot... only then did other begin to grow.
The ideal form (with the 'nipple') was in 2014, when the summer was relatively normal and my location very warm.
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