Steps
1. In a large pot, heat the olive oil over medium heat. Add the minced garlic and sauté until fragrant.
2. Add the sliced mushrooms and cook for about 3-4 minutes until they soften.
3. Stir in the clams and mussels, and pour in the lemon juice. Season with oregano, salt, and pepper.
4. Cover the pot and cook for about 5-7 minutes until the shells open up.
5. In a separate pan, quickly grill or pan-sear the octopus pieces for about 3-5 minutes until they are slightly charred.
6. Once the clams and mussels are open, add the cooked octopus to the pot and stir gently.
7. Serve hot, garnished with fresh parsley and a wedge of lemon on the side.