Is it just me or autumn is the best season to eat grilled mushroom? Ingredients: 1/2 tablespoon harissa 1 tablespoon olive oil 2 tablespoons balsamic vinegar 1 teaspoon dried oregano 8 ounces baby portobello mushrooms, halved lengthwise Method: Whisk the harissa, olive oil, balsamic vinegar, and oregano together in a medium bowl. Add the halved mushrooms and toss well to coat. Marinate for 30 minutes. Preheat the oven to 350 degrees Fahrenheit or Preheat the grill, if grilling. Thread the mushrooms onto presoaked bamboo skewers. Roast them in the oven for 10-12 minutes, or grill them, 5 minutes per side.