Prepare the Parsnips: Halve the peeled parsnips lengthwise, then cut each half into 3 equal pieces.
Place the parsnip pieces in a large pot of boiling water and boil for 5 minutes.
Drain well and toss with the flour to coat.
Preheat the Roasting Tin: Preheat the oven to 220°C (200°C fan) or gas mark 7.
Add the oil to a large roasting tin and heat in the oven for 5 minutes.
Roast the Parsnips: Add the parsnips to the hot roasting tin, turning them in the oil to coat.
Give the tin a shake so the parsnips make contact with the base.
Roast for 30 minutes, turning once halfway through, until golden and crispy.
Finish and Serve: Transfer the roasted parsnips to a serving platter, drizzle with the maple syrup, and scatter with chopped rosemary and flaky sea salt.
Notes / Tips / Wine Advice:
Wine AdvicePair with a dry white wine such as Sauvignon Blanc, which complements the sweet and savory flavors of the roasted parsnips.