Cut the onion into thin half rings. Remove stems from mushrooms and cut caps into quarters. Pepper cut into pieces.
Prepare the mint sauce by blending all the ingredients in a blender.
Season the sea bass fillet with salt and pepper. Heat the pan well and fry the fillet on both sides. Place the skillet in the oven to keep warm.
Season the sea bass fillet with salt and pepper. Heat the pan well and fry the fillet on both sides. Place the skillet in the oven to keep warm.
In another pan, sauté the onion, mushrooms and peppers in vegetable oil. When the vegetables are half cooked, stir in the oyster sauce, sugar and chicken broth. Bring to readiness.
Put vegetables and mushrooms on the bottom of the plates, sea bass fillet on top. Drizzle with warm mint sauce. Serve with deep-fried crispy Thai basil leaves.