⭐ This uses the stir plate I already own for yeast starters, and it is the whole “motorised cocktail infuser” product category for free.
A stir bar in a flask of bourbon, orange peel and cardamom, spinning quietly on the bench for two hours. What comes off it is a bourbon that makes an Old Fashioned needing no orange garnish at all — the citrus is in the whiskey rather than sitting on top of it.
Why stirring works, and it is not just impatience. Extraction is limited by mass transfer: the liquid actually touching the peel saturates, and then everything waits on slow diffusion to carry it away. Continuous agitation never lets that layer settle. It is the same mechanism as the swirl at the end of my flask smoking method — and it turns an overnight steep into an afternoon.
🔴 Cold, and delicate on purpose. Citrus peel and cardamom give their aromatics up readily and heat drives off the best part. This one wants agitation, not warmth. The sous vide route is for dense ingredients.
Ingredients
- 1 1/2 cups bourbon — a mid-range 90–100 proof; do not use the good bottle
- Peel of 2 oranges, wide strips, as little pith as possible
- 6 green cardamom pods, lightly crushed
Equipment
- 1 litre flat-bottomed flask (or any jar that fits the plate)
- Magnetic stir bar
- Magnetic stir plate
- Coffee filter or fine cloth, for straining
Directions
- Peel the oranges in wide strips, taking as little white pith as you can. The oil is all in the coloured outer layer; the pith is coarse bitterness and nothing else.
- Crush the cardamom pods lightly — just enough to crack them open. Do not grind them.
- Peel, cardamom, bourbon and the stir bar into the flask.
- On the plate, stir setting only — HEAT OFF. A moderate speed with a visible vortex is plenty; you do not need it thrashing.
- Two hours, at room temperature. Taste at 90 minutes; citrus can get away from you.
- Strain through a coffee filter or fine cloth. Take the stir bar out first.
- Bottle, label with the date, and store in a cool dark place.
Notes
🔴 SAFETY — the heat function stays OFF. Ethanol boils at 78 °C and its vapour is flammable, and a heated stir plate goes far above that. Stirring is doing all the work here; heat adds very little and a real fire risk. Never leave an open vessel of spirit on a heated plate, and keep it well away from the torch and the smoking gun.
Stop when it tastes right, not when the clock says so. Citrus is fast. Two hours is a starting point; at three it can turn faintly bitter as the pith gives up, and that does not go away.
Do not use your best bourbon. Infusion overwrites a lot of what you paid for. A solid 90–100 proof mid-shelf bottle is the right choice — and the higher proof extracts better.
In an Old Fashioned: build as normal, but skip the orange peel garnish — it is already in there — and consider cutting the orange bitters back to one dash. The lemon twist is still worth it for contrast.
Keeps 3–6 months in a cool dark place. It is stable — 40%+ alcohol — but the citrus aroma fades, so it is best in the first month.
Variations on the same method: grapefruit peel and pink peppercorn · lemon peel and thyme · orange peel and a single clove (one, not two).
The mechanism is explained in the Old Fashioned deep dive, Vol 6: brewing.fubsypoly.com/mixed-drinks/old-fashioned/