Imprimer ma sélection
Preparation
Preheat the oven to 400°F (200°C).
Line a 9 in. x 9 in. (23 cm x 23 cm) dish with parchment paper.
Peel the potatoes, then slice 1/8 in (3 mm) thick using a mandolin.
Place half the sweet potatoes on the bottom of the prepared dish, spreading out over two or three rows. Add salt, pepper and sprinkle 1/2 cup (125 mL) of the cheese.
Top with a layer of potatoes, spreading over three or four rows, season and sprinkle 1/2 cup (125 mL) of the cheese.
Finish with a layer of sweet potatoes.
In a small saucepan, bring cream mixed with the garlic, thyme, and rosemary to a simmer, then pour over the potatoes, making sure the cream goes through all the layers.
Season and add the remaining cheese.
Cover with a sheet of buttered aluminum paper and bake for 1 hour.
Remove the aluminum for the last half hour of cooking.
Check the tenderness of the potatoes with a knife.
Allow the gratin to rest for 20 minutes before serving, or store in the fridge until serving time.