Preheat oven to 400 degrees F (200 degrees C).
Roast sweet potatoes in the preheated oven until tender, about 1 hour; set aside until cool enough to handle.
Halve cooled sweet potatoes lengthwise and scoop the flesh from the peels. Discard potato peels. Mash the sweet potato flesh on a work surface and allow to rest for at least 30 minutes to cool and release moisture.
Transfer mashed sweet potatoes to a bowl and mix with egg yolks, ricotta cheese, and 3/4 cup Parmigiano-Reggiano cheese. Stir in salt, black pepper, and nutmeg. Add flour gradually to the sweet potato mixture until the dough holds together.
Scoop dough by teaspoonful and roll into marble-size balls. Sprinkle a baking sheet generously with semolina flour and place gnudi onto the prepared baking sheet. Refrigerate at least 1 hour or overnight for best texture.
Bring a large pot of salted water to a boil. Reduce heat to low and let the water simmer. Gently drop gnudi, about 12 at a time, into the simmering water and cook until they rise to the surface, about 4 minutes. Simmer for 4 more minutes and remove with a slotted spoon. Keep boiled gnudi warm while you finish cooking remaining batches.
Melt butter in a large skillet over medium heat and cook whole sage leaves until they wilt and are beginning to brown, about 2 minutes; remove leaves. Retain butter in skillet. Stir chopped sage into the hot butter and cook until the butter begins to brown and give off a nutty fragrance, about 2 minutes. Gently mix the gnudi into the butter and sage until gnudi are coated. Garnish with whole sage leaves and sprinkle with 2 tablespoons Parmigiano-Reggiano cheese to serve.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	236.33 Kcal (989 kJ)
Calories from fat	155.74 Kcal
		% Daily Value*
Total Fat	17.3g	27%
Cholesterol	88.14mg	29%
Sodium	359.55mg	15%
Potassium	168.75mg	4%
Total Carbs	14.17g	5%
Sugars	1.34g	5%
Dietary Fiber	1.46g	6%
Protein	7.15g	14%
Vitamin C	0.7mg	1%
Vitamin A	0.5mg	16%
Iron	0.7mg	4%
Calcium	104mg	10%

Amount Per 100 g
Calories	186.34 Kcal (780 kJ)
Calories from fat	122.79 Kcal
		% Daily Value*
Total Fat	13.64g	27%
Cholesterol	69.5mg	29%
Sodium	283.49mg	15%
Potassium	133.05mg	4%
Total Carbs	11.17g	5%
Sugars	1.06g	5%
Dietary Fiber	1.15g	6%
Protein	5.64g	14%
Vitamin C	0.6mg	1%
Vitamin A	0.4mg	16%
Iron	0.5mg	4%
Calcium	82mg	10%

* 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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