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Step 1: Peel and grate potatoes.
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Step 2: In a tea towel, squeeze out the liquid in the potatoes.
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Step 3: Add oil to the bottom of a nonstick pan.
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Step 4: Add a layer of grated potatoes and make a small well in the middle.
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Step 5: Add a layer of onions, then cover it with the rest of the potatoes.
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Step 6: Use your hands to shape the top of the rosti.
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Step 7: Place over medium heat.
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Step 8: Add cubes of butter onto the side so the butter hits the sides of the potato.
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Step 9: Cook for 20-30 minutes and flip halfway through until both sides are golden brown and crispy.