"I'm originally from the Windy City so I love Chicago-style beef. These tender sandwiches lend an authentic flavor, and they're so simple to prepare using a slow cooker. —Lois Szydlowski, Tampa, Florida..."
INGREDIENTS
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1 boneless beef chuck roast (4 pounds)
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1 teaspoon salt
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3/4 teaspoon pepper
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2 tablespoons olive oil
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1/2 pound fresh mushrooms
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2 medium carrots, cut into chunks
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1 medium onion, cut into wedges
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6 garlic cloves, halved
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2 teaspoons dried oregano
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1 carton (32 ounces) beef broth
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1 tablespoon beef base
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12 Italian rolls, split
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1 jar (16 ounces) giardiniera, drained