Combine all dressing ingredients in a wide-mouth jar. Add 1/4 teaspoon salt and 1/8 teaspoon pepper, or season to taste. Shake well until combined and refrigerate until ready to use.
Chop the beets on a dark plastic cutting board to avoid stains. Toast walnuts in a dry pan over medium-low heat, stirring constantly, until fragrant, about 2–4 minutes. Let cool and coarsely chop. Add greens to a large bowl. Top with goat cheese and walnuts.
Drizzle dressing over the portion you plan to eat (dressed salad doesn’t store well). Toss gently, then serve on plates. Add chopped beets to each plate individually to prevent dyeing the entire salad pink.
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Notes
Note 1: Save time by using store-bought, precooked beets. If roasting your own, refer to the “How to Roast Beets” section in the full post. Four ounces is about 2–3 roasted beets.Note 2: Pre-chopped, dry-roasted walnuts work great. I also love this salad with chopped candied walnuts!Note 3: Use a prewashed mix for convenience, such as baby lettuce, spinach, or a spring blend.Storage: If making ahead or saving leftovers, store the dressing separately and dress the salad just before eating.