Preheat the oven to 180°C/350°F and prepare the middle rack
Slice the potatoes into thin slices roughly ½ cm in thickness
Peel and roughly smash the garlic - no need to chop them!
Cut the lemon in half and squeeze all the juice into a roasting pan
Place the herbs, garlic, remaining lemon rind, and all the potatoes in the tray and arrange such that the potatoes from a single layer
Pour the stock and water into the tray and season with salt and pepper, and the chilli flakes
Place the tray in the oven and let the potatoes roast till golden brown on the top. This should take about 20 minutes
Remove the tray from the oven and use tongs to turn all the potato slices over and return the tray to the oven. Top with more water if required
Bake the potatoes till golden brown. They should break apart really easily. Remove these and set aside for a couple of minutes
Line a baking tray with some foil and drizzle some olive oil. Arrange the cooked potatoes in a single layer across the tray and save the roasting liquid. It's optional, but you can top these with some parmesan cheese and some parsley before putting this tray in the oven. This will let the potatoes crisp up just a little on the outside, while retaining their beautiful moisture on the inside
Serve these hot! Pour out the roasting liquid into a small sauce bowl and use this as a simple dipping sauce for the potatoes