Mors is a refreshing berry drink, common in Russia, and made with whatever berries are in season-- from cranberries, to blueberries and black currants. More often than not, a shot of vodka is served with the drink.
Place the berries and water in a saucepan, bring to a boil, cover and cook for 5 minutes.
Pass the liquid through a chinois and return to the saucepan. Add the sugar and lemon juice, then bring to a simmer, stirring constantly, and remove from the heat.
Pass through a chinois again, let cool and refrigerate.
Serve with ice. Vodka optional.