What does rye whiskey bring to pecan pie?

Alton Brown has had a long-standing passion for rye whiskey. His go-to cocktail is the Boulevardier, a robust mix of rye, Campari, and sweet vermouth. He even substitutes rye for bourbon in his Manhattans and, of course, in his old fashioneds as well. For those unfamiliar, an old fashioned is a cocktail made with a few basic ingredients, typically including bourbon, bitters, sugar, and a twist of orange peel.
Using rye instead of bourbon in a pecan pie recipe is a smart choice, as the dessert can often be overly sweet. Generally, rye is less sweet than bourbon, yet it still offers complementary spicy notes of vanilla, oak, and caramel. As Brown mentioned in his Instagram post, bitters also help to balance the pie's sweetness, adding depth with hints of cloves, cardamom, and cinnamon. He uses a generous amount of Angostura Aromatic Bitters in his pie recipe, but he humorously claims that the entire pie only serves one.
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