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Stir 2 tablespoons shredded carrot, 1 tablespoon sweet-and-sour sauce, and 1/8 teaspoon salt into 3/4 cup cooked brown rice. Spoon 2 tablespoons of rice mixture onto a thin slice of deli roast beef. Top with a slice each of red pepper and avocado; then roll up. Cut rolls in half diagonally. Repeat steps to make 12 pieces.