Four Roses Single Barrel Kentucky Straight Bourbon Whiskey 4-Bottle Recipe Bundle — OBSK, OBSF, OESO, OESK 750ml x4

This four-bottle bundle brings together four distinct Single Barrel expressions from Four Roses Distillery in Lawrenceburg, Kentucky, each drawn from a different recipe combination — OBSK, OBSF, OESO, and OESK. Together they represent one of the most educational and compelling tasting sets in American bourbon, showcasing exactly how much the choice of yeast strain and mash bill can transform a whiskey made at the same distillery, in the same warehouse, by the same Master Distiller.

Four Roses uses two mash bills — Mash Bill B (60% corn, 35% rye, 5% malted barley, the higher-rye of the two) and Mash Bill E (75% corn, 20% rye, 5% malted barley, the more corn-forward) — combined with five proprietary yeast strains (V, K, O, Q, F), each of which imparts a distinctly different flavor character. The four-letter recipe code on each bottle tells the full story: the first letter (O) identifies the distillery (Old Prentice/Four Roses), the second letter the mash bill (B or E), the third letter identifies that it is a straight bourbon (S), and the fourth letter is the yeast strain. Each bottle in this bundle is a single barrel expression — one barrel, one unique flavor profile — bottled at 50% ABV and 100 proof.

The Four Recipes — Decoded

ABV / Proof

Tasting Notes

OBSK: Bold spice, full body, rich dark fruit, and baking spice. The combination of the high-rye B mash bill and Yeast K produces one of the most intense and layered expressions in the Four Roses single barrel range.

OBSF: Herbal, creamy, and caramel-forward. Yeast F softens the rye spice of the B mash bill into a rounder, more floral expression with gentle fruit notes and a lighter body.

OESO: Fruity, floral, and elegant — overripe stone fruit, honey, and light oak. Yeast O on the E mash bill produces one of the most approachable and nuanced expressions in the lineup, prized by both new and experienced bourbon drinkers.

OESK: Creamy and balanced — caramel, vanilla, and corn sweetness from the E mash bill with spice and structure from Yeast K. A versatile and crowd-pleasing expression that bridges the gap between the two mash bills.

FAQ

How does Four Roses create so many distinct single barrel expressions?
Four Roses is unique in American bourbon in using two separate mash bills combined with five proprietary yeast strains, creating ten possible recipe combinations. Each yeast strain (V, K, O, Q, F) imparts a distinctly different flavor character — from bold spice to delicate floral notes — while the two mash bills provide either a higher-rye backbone (B, 35% rye) or a more corn-forward base (E, 20% rye). When drawn as single barrel expressions, each recipe emerges as its own entirely separate whiskey despite being produced at the same distillery with the same process.

Why does the proof vary slightly between individual bottles in the set?
Four Roses Single Barrel is bottled at a standard 100 proof (50% ABV) for the core single barrel release. However, barrel-specific variations in label details (warehouse, barrel number, distillation date) mean each bottle in the set comes from a unique individual barrel — the flavor profiles will differ even within the same recipe code from barrel to barrel.

What order should I taste these in?
Starting lightest to boldest is recommended: OESO (most fruit-forward and floral) → OESK (balanced and creamy) → OBSF (herbal and caramel) → OBSK (boldest spice and fruit). This allows the more assertive B mash bill expressions to be appreciated after the palate has been calibrated by the E mash bill bottles.

Where can I buy the Four Roses Single Barrel Recipe Bundle online?
Available here at Liquor On Broadway while stock lasts, with fast insured shipping nationwide.