Strawberry Rhubarb Shrub: cut a pint of strawberries into half. Cut 8 oz (about two stems) of rhubarb into half inch pieces. Cover with 1 cup of sugar and let it macerate for at least 2 hours to a day in the refrigerator. Add 1 Cup of apple cider vinegar and let it sit an additional 2 days in the fridge. Strain out, bottle and refrigerate.