Preheat the oven to 190°C/170°C fan/gas 5.
Toss the fennel, beans and leeks in a roasting tray with the oil, pesto, lemon zest and juice and plenty of salt and pepper.
Roast in the oven for about 30–35 minutes.
Remove from the oven and serve the baked vegetables and beans scattered with chopped hazelnuts and basil leaves, with some warm crusty bread.
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