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In a small bowl, combine the vinegar, oil, sugar, shallot, salt, and dry mustard. Whisk until emulsified. Add the poppy seeds and whisk to incorporate.
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In a large bowl, combine the spinach and herbs. Toss with dressing to taste.
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Arrange the spinach mixture on a large platter, top with the avocado, berries, and almonds. Serve immediately.