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Preheat oven to 375°F.
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Combine milk and vinegar and set aside. In a bowl stir together brown sugar, salt and baking soda. Mix in egg, vanilla and then milk mixture. Stir in flour to form a dough.
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Transfer to a floured surface and knead for a minute until silky.
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Combine butter, sugar and cinnamon until smooth.
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Roll or press dough out into a 12 x24″ rectangle.
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Spread with butter mixture leaving about a centimeter border on every side.
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Roll up starting from the longer side to make a ~ 24″ log.
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Cut into 12 1-2″ sections, and put into a greased or lined muffin tin.
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Bake for 20 minutes.