One of my standard 20 recipes, brewing a high-gravity Imperial Stout requires more than just a big grain bill; it demands patience, a bit of woodcraft, and a tolerance for messy fermenters. For this eighth iteration of Morgana’s Mystical Merkin, I pushed the limits of my “Fermentarium” to create a bourbon-oaked experience that hits both the technical marks and the palate.
The Chaos of a 1.1075 OG
Every great stout begins with a massive starting gravity. I hit 1.1075, and the yeast responded with immediate, violent enthusiasm. As my chest freezer lid shows, the fermentation blew right through the airlock, leaving a “krausen-splattered” reminder of why I usually use a blow-off tube for these big beers.
Wood, Fire, and Spirits
Because I’ve been re-using my staves, I can achieve a smooth, oak-forward profile without the harsh “green” tannins. However, to keep any mold or “funkiness” out of each batch, I follow a specific prep ritual:
- The Boil: I boil the oak staves first to sanitize them.
- The Toast: I place the wet staves into the oven (@ 400F) for 20 minutes. This heat opens the pores of the wood and prepares it soak up the bourbon.
- The Soak: I chose Maker’s Mark Cask Strength for this batch. I submerged the toasted staves in the bourbon to let them absorb that characteristic caramel and vanilla sweetness (for 2.5 days).
The Infusion Timeline
Timing dictates the balance between hop aroma and wood character. I started the dry hop first, then added the bourbon-soaked staves four days later. This allowed the hops to establish their presence before the oak and spirit began their takeover.
I let the staves sit for three days before moving to bottles. This short, intense contact time prevents the oak from becoming overbearing, keeping the focus on the marriage of roasted malt and Maker’s Mark.
Technical Vital Stats
| Metric | Measurement |
|---|---|
| Starting Gravity (OG) | 1.1075 |
| Final Gravity (FG) | 1.027 |
| Alcohol by Volume (ABV) | 10.6% |
| Wood Treatment | Boiled & Oven-Toasted Staves |
| Spirit Addition | Maker’s Mark Cask Strength |
The Verdict
The final product pours like motor oil. The 10.6% ABV provides a warming glow without an abrasive “hot” ethanol burn. Initial tasting reveals some prominent alcohol notes, big chocolate, toast, and maybe some subtle earthy hop character. It transitions into deep malt character and a creamy, full body. The big malt character lingers into the finish, providing a necessary counterpoint to the rich, bourbon-soaked oak.
Morgana’s Mystical Merkin remains a staple in my brewing rotation because it rewards the extra effort of wood preparation and careful spirit selection.
