Peel the kumquats, and place the rind in a large glass jar or container then cover with the alcohol. Seal with a lid leave in a cool, dark place for 10 days.
At the end of 10 days, strain the alcohol and discard the rinds.
Put the sugar and 10 ounces of water into a pot over medium heat, and stir to melt the sugar. Bring to a boil and simmer for 3 minutes, then remove from heat and cool completely. When cool, mix the sugar syrup with the alcohol and strain again, this time using a cheesecloth or even some paper towel inside the tea strainer (like I used in the photo above), then pour into small bottles or one larger bottle.
Keep the Kumquat liqueur in the freezer and enjoy as is, or even mix it with some milk for a creamy, and less potent version.
Notes
Use milk (or milk and cream) for a creamy kumquat liqueur.
Try to find pure cane alcohol (do not use vodka) if you use 190 proof, use only 250 ml and increase the water to 600 ml.
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