INGREDIENTS
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1/2 cup full-fat sour cream, at room temperature
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1/2 pound top round or sirloin steak, trimmed of fat, cut into strips
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1 1/2 teaspoon kosher salt, divided
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1/2 teaspoon black pepper, divided
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1 tablespoon olive oil
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1 large onion, chopped
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16oz fresh, firm button mushrooms, sliced (buy them whole and slice yourself, the pre-sliced are less tasty)
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1 tablespoon minced garlic