This is a recipe for homemade celery shrub that was first used in the Oxford Comma, a modern cocktail derived from the vintage Loop Tonic recipe.
Remove leaves from celery stalks, then juice stalks and measure out 210 ml celery juice.
Add 210 g sugar, 210 ml apple cider vinegar, 15 ml Everclear, 210 ml celery juice, 2.5 ml honey, 0.25 g salt, 0.2 g pepper to a saucepan.
Heat over medium heat while stirring for 2-3 minutes.
Cover pan, then heat for 2-3 more minutes.
Remove from heat and let cool for 5 minutes.
Strain shrub through a fine mesh strainer 1-2 times to remove any sugar particles.
Pour shrub into a squeeze bottle or pouch with a spout using a funnel, then refrigerate or freeze.