1. Preheat Your Oven:
   • Preheat the oven to 200°C (400°F).
2. Clean and Season the Cauliflower:
   • Remove the green leaves and trim the stem of the cauliflower so it can sit flat.
   • Place the cauliflower in a large pot and blanch it in boiling water for 5-7 minutes. This will help soften it slightly and reduce cooking time. After blanching, drain and pat dry.
3. Coat with Seasoning:
   • In a small bowl, mix together olive oil, salt, black pepper, paprika, and garlic powder.
   • Rub this mixture all over the cauliflower, ensuring it’s evenly coated. This will give it a flavorful crust once roasted.
4. Sprinkle Parmesan Cheese:
   • Place the cauliflower on a baking sheet lined with parchment paper.
   • Sprinkle the top with grated Parmesan cheese.
5. Roast the Cauliflower:
   • Roast in the preheated oven for 30-35 minutes, or until the cauliflower is tender and golden brown on the outside.

Step 2: Prepare the Filling

1. Sauté the Vegetables:
   • While the cauliflower is roasting, heat 3 tablespoons of olive oil in a pan over medium heat. Add the diced onion and sauté until soft and translucent.
   • Add the grated carrot and continue cooking for another 3-4 minutes.
2. Season the Filling:
   • Season the mixture with salt, black pepper, garlic powder, and dried parsley. Stir well to combine.
   • If using tuna, add it to the pan and break it up with a spoon. Cook until everything is well combined and heated through. Remove from heat.

Step 3: Assemble and Bake

1. Fill the Roasted Cauliflower:
   • Carefully remove the roasted cauliflower from the oven. Using a small knife, gently create small cavities in the cauliflower florets, making room to spoon in the filling.
   • Spoon the vegetable and tuna mixture into the gaps, trying to stuff it as much as possible.
2. Add Mozzarella Cheese:
   • Sprinkle the shredded mozzarella over the filled cauliflower, allowing it to melt and bind the filling together.
   • Return the cauliflower to the oven and bake for another 10-15 minutes, or until the cheese is melted and bubbly.
3. Garnish:
   • Once baked, remove from the oven and let it cool slightly. Garnish with chopped parsley for a fresh, vibrant touch.

Step 4: Serve and Enjoy

• Slice the cauliflower into wedges and serve hot. Enjoy the combination of roasted, cheesy goodness with the savory filling inside.