Ingredients

• 6 large baking potatoes
• 1 tablespoon salt
• 3 1/2 ounces smoked bacon, thinly sliced vertically
• 3 1/2 ounces onion, diced
• 1 sprig thyme
• 3 1/2 ounces mushrooms, diced
• 2 tablespoons oil
• 2 ounces butter
• 6 slices Gruyere
• Serving suggestion: green salad.

Instructions

1. Watch how to make this recipe.
2. Boil the potatoes in their skins for 20 minutes, drain and leave to cool. Peel them. Using a cheese grater, grate them into a large mixing bowl and sprinkle with salt.
3. In a frying pan saute the bacon and onions. Strip the leaves off the sprigs of thyme into the pan. Add mushrooms and cook for about 5 minutes until soft. Combine with the potatoes and mix gently, taking care not to mash them too much.
4. Heat oil in a frying pan and add 3 or 4 spoonfuls of the mixture, See cook's note*. Using a spatula, pat the mixture into a round flat cake. Brown it over a high heat. When the bottom side is cooked flip it over. Repeat with remaining potatoes to make 6 cakes.
5. Put 1/2 tablespoon of butter and a slice of Gruyere on each cake and melt under a hot grill or broiler. Turn the Rosti onto a plate and serve with a green salad, if desired.