Par-boil your potatoes, this will make it easier to crisp them up in the oven. Peel the potatoes and cut them into chunks, roughly 2cmx2cm. Place the potatoes in a large pot, cover with water and a generous pinch of salt, and bring to the boil. Simmer for 5-8 min, until you can easily put a fork in one but they don’t fall apart. Drain and leave to steam-dry in your strainer for a few minutes.
40min before want to eat, crank the oven up to 400F. On a baking sheet add 3 tbsp of olive oil, 2 cloves of garlic (lightly crushed with the back of a knife) and the potatoes. Season with a bit of salt and toss to combine. Put these in the oven for about 30min, stirring them about 20min in to get all sides crispy.
Remove the potatoes from the oven, and drizzle with a splash of olive oil and the juice and zest of ½ a lemon. Season with salt and pepper, toss to combine and place in your serving bowl.