Spinach and Oyster Mushroom Risotto

Name: Spinach and Oyster Mushroom Risotto
Ingredients: 125 g oyster mushrooms; 2 tablespoons extra-virgin olive oil, plus more for garnish; 4 cloves garlic, chopped; Sea salt; 1 tablespoons mirin (rice wine); 500 ml cups light vegetable broth; 0.5 small red onion, thinly sliced; 3 thinly sliced green onions, white and green parts; 0.75 cup Arborio rice; 0.5 cup dry white wine; 1 packed cups thinly sliced fresh spinach; A pinch of oregano; Squeeze lemon to taste; Freshly ground black pepper; Fried nooch or pesto (see separate recipes) to serve (optional)