1. Heat oil in a large saucepan over medium heat. Add onion and cook, stirring, until beginning to brown, about 4 minutes. Add broth, potato, salt and pepper; bring to a boil. Reduce heat to a simmer, cover and cook until the potato is just tender, about 8 minutes. Add beets and vinegar; return to a boil. Cover and continue cooking until the broth is deep red and the potato is very soft, 2 to 3 minutes more.
2. Combine sour cream and horseradish in a small bowl. Serve the soup with a dollop of the horseradish sour cream and a sprinkle of parsley.
Tips on How to Prep & Steam Beets: (or Look for Melissa's brand Peeled Baby Red Beets in the produce section)
1. Trim greens (if any) and root end; peel the skin with a vegetable peeler.
2. Cut beets into 1/2- to 1-inch-thick cubes, wedges or slices.
3. To steam on the stovetop: Place in a steamer basket over 1 inch of boiling water in a large pot. Cover and steam over high heat until tender, 10 to 15 minutes.
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