Preheat the oven to 425 degrees.
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Place the sweet potatoes, garlic, red onion, Anaheim pepper, olive oil and coriander in a large bowl. Toss to coat. Arrange on a sheet pan. Bake in a 425-degree oven for 30 minutes.
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In the empty bowl, stir together the mustard, mayonnaise, honey, horseradish sauce and salt.
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Add the roasted vegetables to the mustard mix and toss to coat.
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Serve warm or refrigerate and serve chilled.