Pre-heat your oven to 180'C.
Slice the onion thinly and spread it evenly on a baking tray.
Sprinkle the onion with cardamom, cumin, and thyme.
Divide the potatoes in half, then slice them accordion-style all the way through and arrange them on top of the onion slices.
Fan out the potatoes by gently pressing them with your palm.
Add the chicken stock to the potato and drizzle with olive oil.
Season with freshly ground black pepper. Only season with salt if you used unsalted chicken stock.
Cover the tray with foil paper and bake for 30 minutes.
Remove the foil and bake until the potato is tender and crispy on top.
Use your oven's grill function to make the potatoes extra crispy.