Preheat oven to 425°F with racks in upper and lower thirds.
Wrap each potato in foil, then prick potatoes through foil several times with a fork. Cut off and discard 1/2 inch from top of garlic head, exposing cloves. Put garlic on a double layer of foil, then drizzle with 1 tablespoon oil and sprinkle with 1/4 teaspoon salt. Twist foil tightly to enclose.
Roast potatoes and garlic on rack in upper third of oven until tender, 1 to 1 1/4 hours.
About 30 minutes before potatoes and garlic finish roasting, toss parsnips with 1/4 teaspoon salt and remaining 2 1/2 tablespoons oil in a small baking pan. Spread out in an even layer and roast in lower third of oven, stirring once or twice, until tender and golden, about 25 minutes.
Unwrap garlic and cool to warm, then squeeze cloves into a large bowl and mash well with a fork. Stir in roasted parsnips.
Heat milk, butter, white pepper, and 1 1/4 teaspoons salt in a small saucepan over medium-low heat until butter is melted.
While milk mixture heats, unwrap baked potatoes and force through ricer into bowl with garlic and parsnips. (Ricer will catch skins.)
Pour in hot milk mixture and gently stir with a large heatproof rubber spatula until combined.
Cooks' note: Mashed potatoes, with parsnips and garlic, can be made 1 day ahead and chilled, uncovered, until cool, then covered. Reheat with an additional 1/2 cup milk in a heavy saucepan, covered, over low heat, or in a baking dish, covered, in a 300°F oven or in a microwave oven, stirring halfway through heating.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	320.21 Kcal (1341 kJ)
Calories from fat	132.43 Kcal
		% Daily Value*
Total Fat	14.71g	23%
Cholesterol	24mg	8%
Sodium	32.65mg	1%
Potassium	1026.65mg	22%
Total Carbs	44.09g	15%
Sugars	7.6g	30%
Dietary Fiber	4.58g	18%
Protein	5.95g	12%
Vitamin C	40.4mg	67%
Vitamin A	0.1mg	4%
Iron	138.3mg	769%
Calcium	122.8mg	12%

Amount Per 100 g
Calories	104.9 Kcal (439 kJ)
Calories from fat	43.38 Kcal
		% Daily Value*
Total Fat	4.82g	23%
Cholesterol	7.86mg	8%
Sodium	10.7mg	1%
Potassium	336.34mg	22%
Total Carbs	14.45g	15%
Sugars	2.49g	30%
Dietary Fiber	1.5g	18%
Protein	1.95g	12%
Vitamin C	13.2mg	67%
Iron	45.3mg	769%
Calcium	40.2mg	12%

* 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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