Grilled mushrooms with herbed butter

Name: Grilled mushrooms with herbed butter
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Yield: 2 servings
Ingredients: To taste Black pepper; ¼ tsp of Dry oregano; To taste Fine sea salt; 1 tbsp of Fresh chives; 1 clove of Garlic; 1 pinch of Lemon zest; ¼ tsp of Onion powder; ¼ tsp of Paprika; 250 gr of Portobello mushrooms; 30 gr of Unsalted butter