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I don't know how you areI don't know how you are 'cracking' the seeds(kernels)in half, but if you split them in the center you should see something resembling a spoon, fork, or knife. Please refer to the photo on the Almanac site.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?