Start by preheating your oven to 200°C (400°F). Slice the fennel into wedges and cut the potatoes into even chunks. Keeping sizes uniform helps everything cook evenly and caramelise properly.
Place the fennel and potatoes on a baking tray and drizzle with olive oil. Sprinkle salt, pepper, and paprika, then toss well to coat. Roast for about 35–40 minutes, flipping halfway through, until golden and crispy.
In a small bowl, mix tahini, lemon juice, garlic, and salt. Gradually add water while whisking until you get a smooth, pourable consistency. Taste and adjust seasoning if needed.
Combine chopped parsley, lemon zest, and garlic in a bowl. Mix well to create a fresh, zesty topping that balances the roasted flavors perfectly.
Once the vegetables are roasted, transfer them to a serving plate. Drizzle generously with tahini cream and sprinkle gremolata on top. Serve immediately while warm for the best taste.