Using a sharp knife, split open each bean lengthwise. No need to totally cut in half, just make sure the inside is exposed.
Place spliced bean in a glass jar that can fit 1 1/2 cups of liquid and has a tightly fitting cap.
Over with vodka, about 1 cup. You can use a little less or a little more, it won't make a huge difference in the result, just make sure the beans are totally covered.
Secure lid and place in a cool, dry and dark place for a minimum of 8 weeks, but up to 12 months.
If you remember, try to shake it every week or so.
Strain before using.
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