Arrange a rack in middle of oven; preheat to 425°F Brush a foil- or parchment-lined baking sheet with butter; set springform ring on top.
Cut potatoes into 1/8-inch-thick slices with a mandoline.
Toast caraway in a small skillet over medium heat until fragrant, about 1 minute. Let cool.
Place in a resealable plastic bag; crush with a rolling pin or bottom of a skillet. Place in a large bowl.
Add duck fat, 2 tablespoons butter, 1 teaspoon salt, and pepper.
Add potatoes; toss to coat.
Arrange 1/4 of potatoes in an even layer inside ring on baking sheet, overlapping as needed.
Toss onion in a large bowl with 1 tablespoon melted butter.
Arrange 1/3 of onion over potatoes.
Repeat layers twice more, finishing with a layer of potatoes.
Carefully remove ring.
Bake until potatoes are tender, about 45 minutes.
Brush with 1 tablespoon butter.
Bake until edges of potatoes are deep golden and top is crisp, 5-10 minutes longer.
Run a thin spatula under galette to loosen from foil. Slide onto a platter. Season with salt, if desired.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	354.13 Kcal (1483 kJ)
Calories from fat	161.55 Kcal
		% Daily Value*
Total Fat	17.95g	28%
Cholesterol	36.93mg	12%
Sodium	538.28mg	22%
Potassium	1059.33mg	23%
Total Carbs	47.75g	16%
Sugars	6.41g	26%
Dietary Fiber	3.27g	13%
Protein	5.59g	11%
Vitamin C	45mg	75%
Vitamin A	0.1mg	5%
Iron	183.7mg	1021%
Calcium	54.8mg	5%

Amount Per 100 g
Calories	106.71 Kcal (447 kJ)
Calories from fat	48.68 Kcal
		% Daily Value*
Total Fat	5.41g	28%
Cholesterol	11.13mg	12%
Sodium	162.19mg	22%
Potassium	319.19mg	23%
Total Carbs	14.39g	16%
Sugars	1.93g	26%
Dietary Fiber	0.98g	13%
Protein	1.68g	11%
Vitamin C	13.6mg	75%
Iron	55.4mg	1021%
Calcium	16.5mg	5%

* 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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