1/2 pound asparagus , trimmed, cut on the diagonal into 1 1/2-inch lengths (about 1 1/2 cups )
1 pound flank steak , sliced in half lengthwise (along the grain) and then cut into thin strips (across the grain), 2 inches long and 1/4-inch wide (put the steak in the freezer for 15 minutes before slicing to make it easier to slice)
1 red bell pepper , seeded, de-ribbed, and cut into thin strips 2 inches long and 1/4-inch wide
2 teaspoons cornstarch dissolved into 3 tablespoons of water
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