-
1
Praline: Spray baking sheet with nonstick spray. Bring both sugars and half and half to a boil in a heavy medium saucepan over medium-high heat, whisking to dissolve sugar. Reduce heat to medium-low and simmer 5 minutes, whisking constantly. Add butter, vanilla, and salt. Attach candy thermometer to pan. Simmer without stirring until temperature registers 260 degrees, about 8 minutes. Remove from heat; immediately mix in pecans. Transfer to prepared sheet, spreading in a single layer. Cool completely. Chop into 1/4-inch pieces.
-
2
For the Mascarpone Cream: Using and electric mixer, beat all ingredients in a large bowl until firm peaks form. Set aside 1/2 cup mascarpone cream for the pumpkin filling.
-
3
For the Filling: Whisk pumpkin, brown sugar, cream, cinnamon, nutmeg, allspice, and salt in a large bowl to blend. Whisk in reserved 1/2 cup mascarpone cream.
-
4
Spread 1/3 cup mascarpone cream over bottom of an 8x5-inch trifle dish (12-14 cup capacity). Place lay of ladyfingers over cream in bottom of dish (about half of a 3 ounce package). Sprinkle 1 1/2 tablespoons rum over. Spread 1/2 cup pumpkin filling over ladyfingers, spreading to edges. Sprinkle 1/3 cup praline over. Spread 1 cup mascarpone cream over.
-
5
Cover with another layer of ladyfingers. Sprinkle with 1 1/2 tablespoons rum, then spread 1 cup pumpkin filling over. Sprinkle 1/2 cup praline over.
-
6
Repeat 1 more time with 1 cup mascarpone cream, ladyfingers, 1 1/2 tablespoons rum, 1 cup pumpkin filling, and 1/2 cup praline. Spread remaining mascarpone cream over. Cover and chill overnight.
-
7
Can be made 2 days ahead. Keep chilled.
-
8
Uncover trifle. Sprinkle 1 cup praline decoratively over top.