Put oven rack in middle position and preheat oven to 375°F.
Prick potatoes in several places with a fork. Bake potatoes in a large shallow baking pan until tender when pierced with a sharp knife, about 1 1/2 hours.
Transfer to a rack to cool completely, then chill, uncovered, at least 8 hours.
Peel potatoes, then shred with slicer into a bowl. Coarsely grate onion on large teardrop-shaped holds of a box grater, then wrap in 2 layers of paper towels and squeeze gently to remove excess moisture. Toss together potatoes, onion, salt and pepper with a fork.
Heat 2 tablespoons butter and 1 tablespoon oil in a 7- to 8-inch nonstick skillet over moderately high heat until foam subsides, then add potatoes, spreading them evenly and tamping them down with a rubber spatula.
Reduce heat to moderate and cook Rösti until underside is a golden brown, about 5 minutes.
Wearing oven mitts, invert a flat plate over skillet, then invert Rösti onto plate.
Add remaining 2 tablespoons butter and remaining tablespoon oil to skillet and the until foam subsides, then slice Rösti (browned side up) back into skillet with robber spatula.
Cook until underside is golden brown, about 5 minutes.
Transfer to a cutting board and cut into 6 wedges.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	114.47 Kcal (479 kJ)
Calories from fat	109.78 Kcal
		% Daily Value*
Total Fat	12.2g	19%
Cholesterol	20.34mg	7%
Sodium	292.48mg	12%
Potassium	30.37mg	1%
Total Carbs	1.71g	1%
Sugars	0.73g	3%
Dietary Fiber	0.39g	2%
Protein	0.29g	1%
Vitamin C	1.3mg	2%
Vitamin A	0.1mg	3%
Calcium	7.1mg	1%

Amount Per 100 g
Calories	345.08 Kcal (1445 kJ)
Calories from fat	330.94 Kcal
		% Daily Value*
Total Fat	36.77g	19%
Cholesterol	61.31mg	7%
Sodium	881.73mg	12%
Potassium	91.56mg	1%
Total Carbs	5.16g	1%
Sugars	2.21g	3%
Dietary Fiber	1.18g	2%
Protein	0.87g	1%
Vitamin C	3.9mg	2%
Vitamin A	0.3mg	3%
Calcium	21.4mg	1%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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