Tart-sweet and incredibly addictive, these pickled berries are a wonderful finishing touch for salads and sandwiches (trust us: try them on grilled cheese!).
1¼ pound blueberries, washed
1 cup distilled white vinegar
¼ cup sugar
1¾ teaspoon sea salt
¼ cup water
1 small red onion or shallot, thinly sliced
1. Whisk vinegar, sugar, salt, and water in a medium bowl until sugar and salt dissolve.
2. Add blueberries and onion, and cover with plastic wrap. Refrigerate overnight before using.