# Preparation steps:
01 - Rinse the black currants thoroughly. If using fresh currants, remove stems.
02 - In a medium saucepan, combine the black currants, sugar, and water. Bring to a simmer over medium heat. Stir occasionally until the sugar dissolves and the currants burst, approximately 10 minutes.
03 - Remove from heat and let cool slightly.
04 - Puree the mixture using a blender or immersion blender until smooth.
05 - Strain the puree through a fine-mesh sieve into a large bowl, pressing to extract as much juice as possible. Discard seeds and skins.
06 - Stir in the lemon juice.
07 - Pour the strained mixture into a shallow metal baking dish.
08 - Place in the freezer. After 45 minutes, use a fork to scrape and break up any icy edges. Return to the freezer.
09 - Every 30 to 45 minutes, scrape and fluff the mixture with a fork until the granita is fully frozen and fluffy, approximately 4 hours total.
10 - Serve immediately in chilled glasses or bowls.