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Combine the flour, corn meal, and salt in a medium bowl. With your hands, work the butter into the flour until the butter is worked in and there are large flakes throughout. Make a well in middle.
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Whisk your buttermilk, vinegar, and ice water together in a small cup and pour into the well. Using a fork, begin to pull the flour mixture into the liquid. Mix gently until the dough begins to come together.
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Sprinkle the rosemary over the dough. Use your hands to finish bring the dough together. It will be ragged. It's fine. You really don't want to overwork it.
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Tip the dough out onto a piece of plastic wrap. Pat the dough into a roundish, 1" thick disc and wrap tightly in the plastic wrap.
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Put the dough in the fridge to chill for at least an hour, until it is firm enough for rolling out. I usually make the dough the day before and let it firm up overnight.