# Steps:
01 - Rinse black currants thoroughly under cold water and remove any remaining stems or debris.
02 - Combine black currants and water in a medium saucepan. Bring to a gentle simmer over medium heat and cook for 10-12 minutes, stirring occasionally, until currants burst and release their juices.
03 - Remove from heat and let cool slightly. Pass the mixture through a fine-mesh sieve or cheesecloth into a clean bowl, pressing firmly to extract maximum juice. Discard solids.
04 - Return strained juice to the saucepan. Add sugar and optional lemon juice, stirring until sugar dissolves completely.
05 - Bring to a gentle boil, then reduce heat and simmer for 10-15 minutes, stirring occasionally, until syrup thickens slightly and coats the back of a spoon.
06 - Remove from heat and allow to cool completely. Pour into sterilized glass bottles or jars and seal tightly.
07 - Refrigerate for up to one month. Shake before each use.