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Export 6 ingredients for grocery delivery
Step 1
In a large skillet, heat oil over medium-high heat. Add onion and mushrooms; cook, stirring, until well browned, 8 to 10 minutes.
Step 2
Sprinkle in flour and cook, stirring, until golden brown, 3 to 5 minutes. Slowly whisk in vegetable stock, a little at a time, until a smooth sauce forms. Simmer 2 to 3 minutes until thickened. Season with soy sauce, salt and pepper. Serve as is, or pass it through a fine mesh strainer.