Nope.
Pick out the leaves and steps, add the sloes to a Demi-john, add similar measure of sugar. Ikg of Sloes to 1kg of sugar for a liqueur or 1kg Sloes to 750g of sugar for a lighter spirit.
Seal with an air lock (or cling film and an elastic band).
Shake one a week for two or 3 months.
Leave for as long as you can, 4 to six month is OK, 1 year is better.
Add (cheap supermarket) gin @ 1ltr for 1kg of Sloes, shake vigouously one a week for about a month.
Leave for as long as you like, 6 months to a year makes for a really complex and friuty taste.
Slowly decant into another Demi-john through a 10 denier stocking.
Leave for around 2 weeks and then syphon off the clear Sloe gin.
if you freeze or handle/wash the Sloes you kill the natural yeast that is on the skin and it doesn't react with the sugar and make alcohol.
Adding Gin kills the fermentation process.
There is no need to split the Sloes, the fermentation process will do that.
For the first 4 weeks or so you just have sugar and berries in the jar, as you shake the sugar stains a deep red, after 4 to 6 weeks you have a deep red slushy mixture with some sugar in the bottom.
Keep shaking and be patient, the yeast will convert all the sugar to an alcoholic mash.
Below 20 degrees C it takes longer.
The longer you leave the mash, the better, more complex and deeper, the flavours.
The longer you leave the gin in the mash the more the Sloes dominate the flavours.
After a couple of years, even the most "I don't like gin" will drink your Sloe Gin.
If you make it like a liqueur you can add it to expensive Gin, 50:50 doubles your stash, to get the 'it tastes like a flavoured gin' taste back.
Heres one I did earlier.
Will be decanting and bottling in the next few weeks....
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