Pan-cooked mushrooms can be irresistibly delicious, especially when paired with steak. The trick is to stir them just enough to prevent burning, but infrequently enough to let them caramelize a bit. (Same with the leeks, whose sweetness contributes mightily.)

Makes: 4 servings
Time: 45 minutes

Ingredients

• 3 tablespoons olive oil

• 2 pounds mushrooms (like butt…