Jamie's Lyonnaise Potato Cake

Ingredients

• 4 tablespoons balsamic vinegar 
• 1 handful thyme leaves 
• 4 servings olive oil 
• 2  onions sliced
• 9  potatoes peeled sliced
• 4 servings salt and pepper black freshly ground

Equipment

• frying pan
• oven

Directions

1. Preheat the oven to 400 degrees F (200 degrees/Gas 6).
2. Bring a large pan of water to the boil, add the potatoes, and parboil them for 3 to 4 minutes.
3. Drain and set aside.
4. Heat some olive oil in a pan and fry the onions gently with the thyme leaves until meltingly soft.
5. Add the balsamic vinegar and remove from heat.
6. Remove onions to a plate.
7. Using the same pan (no need to wash it), lay half the potatoes in the bottom and season with salt and pepper. Follow with the onions in 1 layer, seasoning again, then the rest of the potatoes.
8. Bake in the preheated oven for about 45 minutes.