Remove the stems from the spinach leaves and put the spinach in a large bowl. Quarter and core apple and thinly slice it. Add the apple to the spinach.
Warm the olive oil over medium-low heat. Whisk in the vinegar and mustard, then season to taste with salt and pepper. Drizzle the dressing over the spinach and toss gently to mix.
Arrange the salads on individual plates, distributing the apples evenly.
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