Remove beef pieces to a large bowl and shred, discarding any purely fat parts. Toss shredded beef with as much of the cooking liquid as you’d like.
TO THICKEN SAUCE
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In a small bowl, stir together 2 Tbsp cornstarch with 3 Tbsp water until smooth. Pour this mixture into the pot with the sauce and select “saute”.
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Cook for several minutes, stirring often, until thickened to your tastes.
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Toss shredded beef with as much of the thickened sauce as you’d like.
TO CRISP THE EDGES
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Line a baking sheet with foil, and preheat broiler to high, adjusting oven rack to the upper third position.
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Spread shredded beef into an even layer, then broil several minutes. Stir. Continue broiling and stirring until crisped and charred to your liking.