In a medium saucepan combine 4 cups water, the whole cloves, cinnamon stick, and sliced ginger. Bring to a gentle simmer over medium heat for 5 minutes to infuse flavors.

Add hibiscus and simmer

Add the rinsed dried hibiscus flowers to the simmering spiced water. Reduce heat to low and simmer gently for 8–10 minutes until the liquid turns a deep ruby red and the flowers have softened.

Sweeten and steep

Remove the saucepan from heat. Stir in the granulated sugar until dissolved, then add the fresh lime juice. Cover and let the mixture steep for 15 minutes to marry flavors and allow solids to settle.

Strain concentrate

Strain the hibiscus mixture through a fine-mesh sieve lined with a double layer of cheesecloth (or a fine sieve) into a heatproof bowl or pitcher, pressing gently on the solids to extract liquid. Discard or compost the solids (or reserve a spoonful for garnish if desired).

Cool

Allow the hibiscus concentrate to come to room temperature, then chill in the refrigerator until cold, about 1 hour. The concentrate can be stored refrigerated in a sealed container for up to 5 days.

To Serve

Dilute to taste

To make a refreshing hibiscus juice, mix 1 part chilled hibiscus concentrate with 3–4 parts cold water for a lightly sweetened drink (adjust dilution to taste). For a fizzy version, use club soda or sparkling water in place of still water, adding it just before serving to preserve bubbles.

Serve over ice

Fill glasses with ice cubes. Pour the diluted hibiscus juice over the ice.

Garnish and finish

Garnish each glass with a lime wedge and a sprig of fresh mint if using. Taste and adjust sweetness or acidity by stirring in more sugar or a squeeze of lime if needed.

Storage note

Leftover diluted juice is best consumed the same day. Hibiscus concentrate (undiluted) will keep refrigerated up to 5 days; re-stir before using as separation may occur.