Vegan Mushroom Gravy

This is delicious and makes quite a bit.

½ cup extra-virgin olive oil
½ small onion, finely chopped (½ cup)
4 ounces mushrooms, finely chopped (1 cup)
½ cup all-purpose flour
4+ cups vegetable stock
1 teaspoon soy sauce, more to taste
½ teaspoon kosher salt
¼ teaspoon black pepper

In a large skillet, heat oil over medium-high heat. Add onion and mushrooms; cook, stirring, until well browned, 8 to 10 minutes.

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.