Nina s Russian Cold Beet Soup (Kholdnyk)

4 cups fat-free buttermilk

1 cucumber - peeled, seeded, quartered lengthwise and diced

1 (15 ounce) can sliced beets with liquid

3 green onions, chopped

2 tablespoons chopped fresh dill

½ teaspoon salt, or to taste

2 tablespoons white vinegar, or to taste

Mix the buttermilk, cucumber, beets with their juice, green onions, dill, salt, and vinegar in a bowl; stir to mix thoroughly, and chill, covered, in refrigerator at least 2 hours or overnight for best flavor. Serve cold.