Ingredients
- 4 portobello mushroom caps , stemmed and gills removed
- 2 tablespoons extra-virgin olive oil
- 3 cloves garlic , peeled and smashed
- ¼ teaspoon salt
- ¼ teaspoon ground pepper
- ⅓ cup unsalted chicken broth
- 1½ tablespoons balsamic vinegar
- 2 tablespoons cold unsalted butter , cut into pieces
- 2 (3-inch) sprigs fresh rosemary , plus 1 sprig for garnish
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