
Bourbon is America’s own whiskey: at least 51% corn, aged in new charred oak, and made only in the US. After distilling, nothing goes in but water — no coloring, no flavoring.
Every American whiskey near it is drier or spicier, so a swap moves the drink along the sweet-to-spicy line instead of leaving it where it was. Strength matters more than the grain: below about 45% an Old Fashioned goes watery long before it goes wrong.
Tennessee whiskey meets every bourbon requirement and then filters through sugar-maple charcoal before the barrel. That smooths the edges, so an Old Fashioned comes out softer and a shade less spicy.
Rye’s mash is at least 51% rye, which is where the dryness and pepper come from; bourbon leads on corn and is sweeter and rounder. A Manhattan on rye comes out drier and sharper, and it needs less vermouth.
"Jack Daniel’s is a bourbon"
It meets every federal requirement for bourbon and declines the word: Tennessee whiskey is defined by state law as a straight bourbon made in Tennessee and filtered through sugar-maple charcoal. So a recipe naming bourbon is not wrong with it — the charcoal step just makes it a softer one.
What sets one brand apart is the second grain in the mash: more rye for spice, wheat for a softer, rounder style.
Boulevardier – IBA
Bourbon