Make Spiced Pecans: Preheat the oven to 350 degrees F.
Place the pecans in a single layer on a baking sheet and toast them for 10 minutes, until fragrant. Meanwhile, combine the brown sugar, cinnamon, and nutmeg in a medium bowl, using your fingers to mix everything thoroughly. Stir in the melted butter to make a paste. Add the toasted pecans to the mixture and stir to coat, then spread them evenly on the baking sheet and return to the oven for 8 minutes. Remove from the oven, drizzle over the rum, and bake for 8 more minutes, stirring once. Remove from the oven, cool completely and leave the oven on. When cool, chop the pecans into medium-fine pieces, some larger than others, and set aside.
Meanwhile, pierce the sweet potatoes with a fork. Microwave on high until very tender, about 8 minutes per side. Cool, peel, and mash the sweet potatoes with a potato masher or fork.
Lower oven temperature to 325 degrees F. Spray 2 (8-inch) round cake pans with nonstick baking spray and set aside. In the bowl of an electric mixer fitted with the paddle attachment, beat the eggs and sugar together on medium speed until light and fluffy, 4 minutes. Add the canola oil; beat on medium until combined. Add the mashed sweet potatoes and mix until combined. Sift together cake flour, baking powder, salt, cinnamon, nutmeg, and ginger and then mix the dry ingredients into the sweet potato mixture. Mix in vanilla and rum. Fold in 1 1/4 cups of the chopped Spiced Pecans by hand. Evenly distribute cake batter into the prepared pans, and transfer to the oven. Bake until a toothpick inserted into the center comes out clean, 40 to 45 minutes. Let pans cool on a wire rack 10 minutes. Invert cakes onto rack; cool completely.
Make the buttercream while the cake is baking: Beat the egg yolks in the clean bowl of an electric mixer fitted with the paddle attachment on medium-high until very thick, about 5 minutes. Combine the sugar with the syrup in a small saucepan, and set over medium-high heat, stirring constantly until the mixture comes to a full boil. Immediately scrape the mixture into a heatproof 1-cup glass measure. With the mixer on high speed, pour a few tablespoons of the sugar mixture into the yolks and beat for a few seconds. Repeat until all of the syrup has been added. Beat until the bowl has cooled to room temperature. On medium speed, add the butter, 2 tablespoons at a time, beating well after each addition. The frosting will begin to come together after all of the butter has been incorporated (it will look curdled first, but be patient and it will come together beautifully!). Scrape the bowl and beat in the vanilla and salt. Mix in 3/4 cup chopped Spiced Pecans.
Cut each cooled cake layer in half horizontally, creating 4 layers. Set 1 layer, cut side up, on a cake round or cake plate and spread a thin layer of frosting on the surface. Stack next layer on top, and frost. Repeat frosting-and-stacking process until each layer is frosted. Spread remaining frosting on sides and top of cake. Arrange remaining Spiced Pecans decoratively on top of cake. Chill for 1 hour or serve immediately if you can't wait!
A viewer, who may not be a professional cook, provided this recipe. The Food Network Kitchens chefs have not tested this recipe and therefore, we cannot make representation as to the results.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	2159.66 Kcal (9042 kJ)
Calories from fat	1741.72 Kcal
		% Daily Value*
Total Fat	193.52g	298%
Cholesterol	298.77mg	100%
Sodium	1068.73mg	45%
Potassium	793.64mg	17%
Total Carbs	172.41g	57%
Sugars	58.95g	236%
Dietary Fiber	10g	40%
Protein	29.07g	58%
Vitamin C	2.5mg	4%
Vitamin A	1.4mg	48%
Iron	6mg	33%
Calcium	191.1mg	19%

Amount Per 100 g
Calories	566.96 Kcal (2374 kJ)
Calories from fat	457.24 Kcal
		% Daily Value*
Total Fat	50.8g	298%
Cholesterol	78.43mg	100%
Sodium	280.57mg	45%
Potassium	208.35mg	17%
Total Carbs	45.26g	57%
Sugars	15.48g	236%
Dietary Fiber	2.62g	40%
Protein	7.63g	58%
Vitamin C	0.7mg	4%
Vitamin A	0.4mg	48%
Iron	1.6mg	33%
Calcium	50.2mg	19%

* 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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