In a medium bowl, combine 1/4 cup sour cream and 1 tbs prepared horseradish. Fold in one cup coleslaw mix. Dividing evenly, top two 10 inch flour tortillas with 2 cups flat leaf spinach or arugula, 6 ounces sliced roast beef, 4 ounces sliced cheddar and the slaw. Roll up tightly, folding in the sides. Wrap and refrigerate for up to 1 day.
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