Not sure if anyone's tried it before but there's a recipe for a Chocolate Mint Stout in the Radical Brewing book. I've been toying with the idea of trying it but I'm not sure.
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Dave
My Blog - Morgan River Brewery
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Primary: Bucksnort Brown Ale, Black IPA, Chai Brown Ale, Chocolate Porter Secondary: Winter Mead, Peach Ginger Mead Tertiary: Caramel Apple Mead Bottled: Honey Brown Ale, Cream Ale On Deck: not sure