This riff on the Black Velvet replaces the Champagne with Prosecco and the Guinness with raspberry-flavored lambic, a type of wheat beer made with wild yeasts.
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In a chilled pint glass, combine the lambic and crème de framboise and stir gently. Pour the drink into a chilled flute and top with the Prosecco. Garnish with the rosemary-skewered raspberries.