FOUR ROSES BOURBON SINGLE BARREL OESF

As its recipe code denotes, OESF is made by combining Mashbill E with the F yeast strain. As a reminder, Mashbill E is their“bright grains” mashbill, whereas its counterpart Mashbill B is more rye-forward. To give you a better idea of how OESF tastes and performs in blends, here’s a breakdown from their Master Distiller, Brent Elliott:

"The F yeast strain is very unique with the herbal and minty character that it develops through fermentation. Because of the ability of these unique flavors to influence the final flavor of a blend, it has been used for years in Four Roses Bourbon at a low level to add dimension and layers of complexity. In OBSF, which employs our rye-forward mashbill, the F characteristics and rye flavors enhance one another with somewhat similar characteristics. In the OESF, however, the clean, herbal character of the yeast strain is less influenced by the rye, allowing the flavors of the yeast to be more apparent and meld elegantly with the mellow grain notes."