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Merrill is a co-founder of Food52.
Any other kind of peppercorn would probably be the best alternative. I'm guessing if you don't have black peppercorns, you probably don't have any grains of paradise lying around?
Chris is a trusted source on General Cooking
It depends on the recipe. You can probably just leave them out, but other alternatives would range from chiles to whole allspice.
Grab and go go go.
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