Make gingerbread: Preheat oven to 350°F with rack in middle. Butter a 13- by 9-inch baking pan. Line pan with foil, leaving an overhang at both ends, then butter foil.
Whisk together flour, baking soda, spices, and salt.
Beat butter and brown sugar with an electric mixer at medium speed until pale and fluffy, 3 to 5 minutes. Beat in egg until blended, then beat in molasses and buttermilk. At low speed, mix in flour mixture until smooth, then add hot water and beat 1 minute (batter may look curdled).
Spread batter evenly in pan and bake until a wooden pick inserted into center comes out clean, 35 to 40 minutes. Cool in pan. Using foil as an aid, transfer gingerbread to a cutting board and cut into 1-inch cubes with a serrated knife.
Make pumpkin mousse: Sprinkle gelatin over cold water in a small saucepan and let soften 1 minute. Bring to a simmer, stirring until gelatin has dissolved. Whisk together gelatin mixture, pumpkin, brown sugar, spices, and salt in a large bowl until combined well.
Beat cream with vanilla using cleaned beaters until it holds soft peaks, then fold into pumpkin mixture gently but thoroughly.
Make whipped cream: Beat cream with sugar and vanilla using mixer until it holds soft peaks.
Assemble trifle: Put half of gingerbread cubes in trifle bowl. Top with half of pumpkin mousse, then half of whipped cream. Repeat layering once more with all of remaining gingerbread, mousse, and cream. Chill at least 2 hours before serving.
Cooks' notes: Gingerbread (uncut) can be made 1 day ahead and kept in pan at cool room temperature (covered once cool). Trifle, without top layer of whipped cream, can be made 1 day ahead and chilled; whip half of cream just before serving.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	394.92 Kcal (1653 kJ)
Calories from fat	157.88 Kcal
		% Daily Value*
Total Fat	17.54g	27%
Cholesterol	70mg	23%
Sodium	257.32mg	11%
Potassium	294.27mg	6%
Total Carbs	57.6g	19%
Sugars	40.42g	162%
Dietary Fiber	0.77g	3%
Protein	3.29g	7%
Vitamin C	0.3mg	1%
Vitamin A	0.1mg	3%
Iron	1.3mg	7%
Calcium	79.7mg	8%

Amount Per 100 g
Calories	314.21 Kcal (1316 kJ)
Calories from fat	125.61 Kcal
		% Daily Value*
Total Fat	13.96g	27%
Cholesterol	55.69mg	23%
Sodium	204.73mg	11%
Potassium	234.13mg	6%
Total Carbs	45.83g	19%
Sugars	32.16g	162%
Dietary Fiber	0.61g	3%
Protein	2.62g	7%
Vitamin C	0.2mg	1%
Vitamin A	0.1mg	3%
Iron	1mg	7%
Calcium	63.4mg	8%

* 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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