Golden and Purple Beet-Pickled Eggs

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1 pound red or golden beets, stems and leaves removed

1/2 cup apple cider vinegar 

1/4 cup granulated sugar 

1 teaspoon turmeric, if using golden beets 

1/2 teaspoon whole black peppercorns 

1/4 teaspoon pickling spice 

6 large hard-boiled eggs, peeled 

1 small yellow onion, peeled and sliced