Preheat your oven to 220C.
Peel your potatoes and chop them into large chunks.
1.5 kg Maris Piper Potatoes
Place the potatoes in a large saucepan, and pour over just-boiled water so that the potatoes are fully submerged. Add the baking soda.
Parboil the potatoes until you can just pierce them with a knife (about 10 minutes).
In the meantime, add your oil to a large baking tray (two, if needed - you want to avoid over-crowding the potatoes) and pop in the oven for 5 minutes so the oil can heat up.
4 tbsp vegetable oil
Mix your potato seasonings, salt and pepper, baking soda, and the flour.
1 tsp baking soda, 1 tbsp plain flour, 2 tbsp roast potato seasoning, Salt & pepper to taste
Drain the potatoes and give the saucepan a shake (lid on!) to rough them up, creating lots of fluffy edges that will get crispy in the oven. Leave to steam-dry for 5 minutes.
Remove the baking tray from the oven and carefully tip the potatoes into the tray - tip away from you to avoid the hot oil splashing up and burning you.
Sprinkle the flour and seasoning over the potatoes, carefully flipping each one, ensuring every potato is coated.
Roast the potatoes in the oven for 25 minutes.
Mince your garlic and chop the fresh rosemary finely, then combine in a bowl with the lemon zest and extra-virgin olive oil.
3-4 sprigs fresh rosemary, 2 cloves of garlic, 1 lemon, 2 tbsp EVOO
Remove the potatoes from the oven and coat them in the garlic and rosemary dressing, flipping halfway to ensure they're evenly coated.
Roast them for another 20 minutes or until beautifully golden and crispy.
To make them really extra, top them with chopped fresh rosemary, oregano, and parsley and a squeeze of lemon juice at the end.