Using ingredient margarine to prevent sticking if necessary

Swiss Fried Potatoes

• 10 skillet until melted
• 4 potatoes
• 1 onion
• 1 water (salted)
• 1/2 gruyere (diced)
• 240 ml water
• 55 gr margarine
• 30 ml water
• 20 gr margarine to prevent sticking if necessary
• 1 gr salt