In a small bowl, combine the vinegar, shallot, mustard, salt, and pepper. Gradually whisk in the oil to make a creamy dressing.
Put all but a large handful of the spinach in a large bowl. Toss with most of the dressing. Add remaining spinach and continue tossing until well coated.
Serve immediately topped with goat cheese and walnuts.
If your walnut oil is very strong, use half walnut oil and extra-virgin olive oil.
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