My son in law will be making his grandmother's famous buttermilk
pancakes for us on Christmas morning. He had to buy a 1/2 gallon of
buttermilk, because that was the only size available and that means I
need to figure out what to do with the rest. Buttermilk biscuits are
obvious, but we don't have ham at Christmas - so, I'm wondering if I
can make a straight substitution of buttermilk for regular milk in
dinner rolls? Thanks!

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Never trust a dog to watch your food.