"Create a detailed recipe for 'Decadent Beetroot Risotto That Will Steal Hearts This Valentine’s' using fresh beetroot. The recipe should be vegetarian, beginner-friendly, and serve 4 people. Include ingredients like Arborio rice, fresh beetroot, vegetable broth, white onion, garlic, white wine (optional), olive oil or butter, Parmesan cheese or vegetarian alternative, fresh thyme or rosemary, lemon zest, salt, black pepper, and optional cream or mascarpone. Provide clear step-by-step instructions."