Low-Carb Black Widow Cocktail

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3.50 from 154 votes

Low-Carb Black Widow Cocktail

30 minutes


  • 450 grams frozen blackberries (or fresh, 1 lb)
  • 1/4 cup lime juice (or fresh, 1 lb)
  • 1 cup water (or fresh, 1 lb)
  • 1/2 cup erythritol (or fresh, 1 lb)
  • 90 milliliters juice (or fresh, 1 lb)
  • 1/4 cup vodka (or fresh, 1 lb)
  • carbonated water (or fresh, 1 lb)
  • a powder


  • Place the blackberries in a saucepan.
  • Add the lime juice and water.
  • Bring to a boil over a medium heat.
  • Boil for 3-5 minutes.
  • Once softened, mash the blackberries using a fork.
  • Pour through a fine mesh sieve and using a spoon, press the blackberries through so that only the skins and seeds remain in the sieve.
  • Pour into a jar.
  • The juice should be quite thick, almost the consistency of syrup.
  • Add the powdered Erythritol and mix until combined.
  • Let it cool and refrigerate until ready.
  • The juice will keep refrigerated for up to 5 days.
  • To serve, optionally decorate your cocktail glasses by dipping the rims in water and then in a mixture of acai powder (or any berry powder).
  • Fill each glass with ice and pour in the vodka.
  • Add the sweetened blackberry juice.
  • Decorate with more fresh blackberries or mint leaves and serve.

Originally posted 2019-02-20 17:40:21.

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