Pre heat your oven at 200C with your oven dish inside
To a pestle and mortar add the fresh thyme (pull the leaves away from the stalks) crushed garlic clove, 3 tbsp olive oil, pinch of salt and pepper and mix
Slice downwards on the potatoes, I use chopsticks or wooden spoons laid down this helps create and even depth and stops you slicing all the way through the potato
Place the potatoes in the oven dish, then evenly spread the thyme oil over, making sure it gets deep inside the potatoes. Season with a pinch of salt and pepper and place in the oven for 45 minutes at 200C
Season with a pinch of salt and pepper and a sprinkle of fresh thyme and serve
You could always make these the day before Christmas and just reheat them by placing back in the oven for 15-20 minutes before serving.