Conclusion. Limoncello has a decent shelf-life because of the alcohol content. It is best to make it in small batches and enjoy it fresh. Limoncello can be preserved by adding sugar, water, or vodka to dilute the alcohol content and extend its life span for up to 1 year if stored properly in the freezer.
2. Let the lemon peel macerate. Once the lemon rinds and alcohol have been combined, put the sealed glass jar in a cool dark place out of direct sunlight for at least 4 days and up to 20 days. The longer you wait the more lemony your limoncello will become. 3. Make the simple syrup.
In the process of making Limoncello, steeping lemon zest (peels) in highly concentrated ethanol or vodka until the oil has been released yields a yellow liquid that is then mixed with simple syrup. The alcohol content varies, particularly among homemade varieties, but is typically measured in the 25 to 30% range.
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