I start by preheating my oven to a high temperature so everything roasts properly. Then I slice fennel and halve the potatoes evenly for consistent cooking. I toss them with olive oil, garlic, salt, and pepper until well coated.
I spread everything on a baking tray in a single layer for even roasting. As it cooks, the fennel turns golden and slightly sweet around the edges. I flip halfway so the potatoes crisp up beautifully on both sides.
In a bowl, I whisk tahini with lemon juice, garlic, and water slowly. It thickens first, then becomes silky and smooth as I keep mixing. I adjust salt and consistency until it feels pourable but creamy.
I finely chop parsley and mix it with lemon zest and garlic. This fresh topping brings brightness that balances the roasted flavors. I keep it ready just before serving for maximum freshness.
I layer roasted fennel and potatoes on a serving plate. Then I drizzle tahini cream generously over the warm vegetables. Finally, I sprinkle gremolata on top for color and freshness.