makes about 2 cups, 4–6 servings
For oven roast: Preheat oven to 375°F. Cut off beet greens, leaving 1-inch stems; leave root intact. Scrub clean with water and place in a glass baking dish. Add water to about ¼ inch, cover tightly with foil, and bake for 45–60 minutes, until beets are fork-tender. When cool enough to handle, peel skin, and cut off roots and tops. Cut into very small dice (see note) and transfer to jar or small bowl.
In a small jar or glass measuring cup, combine the shallots, capers, vinegars, horseradish, Worcestershire, a couple pinches of salt, and a few grinds of fresh black pepper. Drizzle over tiny-diced beets and refrigerate for up to a week.
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