Preheat the oven to 200?C.
In a large bowl, toss the potatoes with the olive oil and salt. Divide potatoes among 2 baking paper-lined oven trays. Transfer the trays to the oven and roast for 40 minutes, turning once, until golden.
Place a large frying pan over medium-high heat. Add the extra-virgin olive oil, garlic, and coriander and cook for 1-2 minutes until the garlic starts to change colour. Add the lemon juice and the hot potatoes to the pan and toss lightly to coat. Season to taste and sprinkle with the cayenne pepper.
Serve hot