Preheat the oven to 375°C. Heat oil in a skillet over medium heat and add smashed garlic clove and swirl to infuse garlic into the oil. Pat fish dry and season with salt and pepper. Sear both sides until golden. Place in the warm oven until cooked through to your liking. In a skillet, heat oil over medium heat and add shallots and garlic, stirring until softened. Add zucchini noodles and season with salt and pepper. Sauté until noodles soften. Toss in lemon zest, fresh parsley and a squeeze of lemon. Taste for salt and lemon and adjust if necessary. Divide among two bowls and top with the halibut. Garnish with halved cherry tomatoes, chilli flakes and shaved pecorino cheese if you like.