Make ice cream: Finely chop chestnuts and cook with 1 1/4 cups milk at a bare simmer in a large heavy saucepan, uncovered, stirring occasionally, 15 minutes. Purée in a blender until smooth (use caution when blending hot liquids).
Bring cream and remaining 1 3/4cups milk just to a simmer in heavy saucepan and remove from heat.
Beat together yolks and brown sugar in a large bowl with an electric mixer at high speed until thick and pale and mixture forms a ribbon when beaters are lifted.
Whisk 1/3 of hot cream mixture into yolk mixture to temper, then whisk yolk mixture into remaining cream mixture. 3Whisk in chestnut purée and salt, then add zest. Cook over moderately low heat, stirring constantly, just until mixture registers 170°F on an instant-read thermometer (do not boil).
Immediately pour custard through a fine sieve into a clean metal bowl and stir in vanilla. Set bowl in a larger bowl of ice and cold water and cool custard, stirring occasionally. Chill, surface covered with waxed paper, until cold, at least 3 hours.
Freeze custard in ice-cream maker, then transfer to an airtight container and put in freezer to harden.
Make sauce: Bring cream just to a simmer in a heavy saucepan over moderate heat and remove from heat. Add chocolate and butter, whisking until smooth. Whisk in Grand Marnier.
Serve ice cream with sauce.
Cooks' note: Custard can be chilled up to 24 hours.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	1817.5 Kcal (7610 kJ)
Calories from fat	1180.38 Kcal
		% Daily Value*
Total Fat	131.15g	202%
Cholesterol	977.49mg	326%
Sodium	885.85mg	37%
Potassium	1131.85mg	24%
Total Carbs	101.51g	34%
Sugars	57.13g	229%
Dietary Fiber	5.93g	24%
Protein	65.11g	130%
Vitamin C	1.4mg	2%
Vitamin A	0.1mg	5%
Iron	7.9mg	44%
Calcium	705.7mg	71%

Amount Per 100 g
Calories	204.62 Kcal (857 kJ)
Calories from fat	132.89 Kcal
		% Daily Value*
Total Fat	14.77g	202%
Cholesterol	110.05mg	326%
Sodium	99.73mg	37%
Potassium	127.43mg	24%
Total Carbs	11.43g	34%
Sugars	6.43g	229%
Dietary Fiber	0.67g	24%
Protein	7.33g	130%
Vitamin C	0.2mg	2%
Iron	0.9mg	44%
Calcium	79.5mg	71%

* 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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