Muddle together the strawberries, basil leaves, and sugar. Let sit at room temperature for 2 hours.
Add the champagne vinegar. Muddle well. Transfer to a quart-sized jar or container. Cover and refrigerate for 2 days.
After the 2 days, open your jar and muddle again, very well. Strain and discard the seeds. Use your hands to squeeze out as much of the shrub liquid as possible Store in a sealed container in the refrigerator.
Notes
To enjoy a shrub mocktail, mix 1 tbsp of the shrub with 1 cup of sparkling water. Serve over ice.If you do not havechampagne vinegar, you can substitute for apple cider vinegar.The shrub mixture can sit in the refrigerator for up to 5 days, so if you forget it after the 2 resting days, it is OK.Save the discard strawberry parts. They are delicious in salads or grains like rice & farro. You can also use them as a relish over duck, grilled steak, or chicken!A shrub does not have to be refrigerated, but prefer to refrigerate them. They can last for years. I have a some shrub in my refrigerator from a large batch I made two years ago and still use it regularly. Typically, it lasts a minimum 6 months in the refrigerator. If used frequently, it keeps 6-8 weeks like other condiments. If you can avoid contamination and use a sterile bottle, you will get a longer longevity of the shrub.