Make cake: Put oven rack in middle position and preheat oven to 350°F. Butter bundt pan generously, then dust with flour, knocking out excess.
Whisk together flour (2 1/4 cups), baking powder, baking soda, cinnamon, allspice, and salt in a bowl. Whisk together pumpkin, 3/4 cup buttermilk, and vanilla in another bowl.
Beat butter (1 1/2 sticks) and granulated sugar in a large bowl with an electric mixer at medium-high speed until pale and fluffy, 3 to 5 minutes, then add eggs and beat 1 minute. Reduce speed to low and add flour and pumpkin mixtures alternately in batches, beginning and ending with flour mixture and mixing until batter is just smooth.
Spoon batter into pan, smoothing top, then bake until a wooden pick or skewer inserted in center of cake comes out clean, 45 to 50 minutes. Cool cake in pan on a rack 15 minutes, then invert rack over cake and reinvert cake onto rack. Cool 10 minutes more.
Make icing: While cake is cooling, whisk together buttermilk and confectioners sugar until smooth. Drizzle icing over warm cake, then cool cake completely. Icing will harden slightly.
Cooks' note: Cake can be made 3 days ahead and kept in an airtight container at room temperature.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	508.11 Kcal (2127 kJ)
Calories from fat	220.33 Kcal
		% Daily Value*
Total Fat	24.48g	38%
Cholesterol	107.51mg	36%
Sodium	224.63mg	9%
Potassium	178.11mg	4%
Total Carbs	69.89g	23%
Sugars	50.23g	201%
Dietary Fiber	0.98g	4%
Protein	4.39g	9%
Vitamin C	1.1mg	2%
Vitamin A	0.3mg	9%
Iron	0.7mg	4%
Calcium	59.2mg	6%

Amount Per 100 g
Calories	394.02 Kcal (1650 kJ)
Calories from fat	170.86 Kcal
		% Daily Value*
Total Fat	18.98g	38%
Cholesterol	83.37mg	36%
Sodium	174.19mg	9%
Potassium	138.11mg	4%
Total Carbs	54.2g	23%
Sugars	38.95g	201%
Dietary Fiber	0.76g	4%
Protein	3.4g	9%
Vitamin C	0.9mg	2%
Vitamin A	0.2mg	9%
Iron	0.5mg	4%
Calcium	45.9mg	6%

* 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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