Ingredients

• 2 pounds rhubarb, cut into 1/4" pieces (about 6 cups)
• 1 (7-inch) piece ginger, unpeeled, cut into 1/4" coins (about 1/4 cup)
• 3/4 cup apple cider vinegar
• 1 1/4 cups sugar
• 2 ounces gin
• 1/2 ounce fresh lime juice
• Club soda (for serving)

Instructions

1. Combine rhubarb, ginger, vinegar, and sugar in a medium saucepan over medium-high heat. Cover and bring to a boil, then reduce heat to low. Cook, stirring occasionally, until rhubarb is completely broken down and strands are visible, 10–15 minutes.
2. Using a fine-mesh sieve or a colander lined with cheesecloth, strain mixture into a glass container. Let cool to room temperature, then chill.
3. Combine gin, lime juice, and 1 1/2 ounces reserved ginger-rhubarb shrub in a cocktail shaker. Fill shaker with ice and shake until outside of shaker is frosty, about 30 seconds. Strain into an ice-filled Collins-style glass, filling three-quarters full. Top off with club soda.