Add potatoes to a pot of very salty water with thyme, rosemary, garlic & lemon peel. Bring to boil then reduce heat to low and cook for 25 minutes, or until tender but not mushy.
Drain & cool in the fridge for 30-60 minutes to set the potato starch.
Lightly crush each potato with the palm of your hand to flatten.
Heat olive oil in a 12-inch cast iron pan over medium-high heat. Add potatoes and fry for 5 min until crispy.
Toss the pan to flip potatoes and continue cooking for another 2 minutes
Transfer to 450F/230C oven to roast for another 10-15 minutes
The final potatoes should be crispy and dark golden brown in some places with a soft creamy center. These potatoes are a textural dream.