This is a fantastic and elegant side dish! The natural sweetness and creamy texture of sweet potatoes perfectly complement the tart, fruity flavor of blueberries. And gratinating (baking in a creamy, cheesy sauce) makes the dish rich and festive.

Here is a recipe for Sweet Potato and Blueberry Gratin, ideal for the holiday table:

🍠 Sweet Potato and Blueberry Gratin (Creamy Tart Side Dish)
This gratin combines savory and sweet flavors, and is incredibly rich and satisfying.

🛒 Ingredients
2 large or 3 medium sweet potatoes (approx. 1 kg)
1 cup (approx. 120 g) fresh or frozen blueberries (if frozen, do not thaw beforehand)
1 cup (250 ml) heavy cream (min. 30%)
1/2 cup (125 ml) milk

2 tablespoons maple syrup or brown sugar (for sweetness)
1 teaspoon sea salt (or to taste)
1/2 teaspoon freshly ground black pepper
1/4 teaspoon ground nutmeg (essential)
1 tablespoon butter (for greasing the baking dish)
🧀 Cheese topping (Optional, but recommended)
1/2 cup (approx. 50 g) grated Parmesan or soft goat cheese (for tart flavor)
👩‍🍳 Preparation

1. Preparation (15 minutes)
   Preheat oven to 190°C. Butter a medium-sized gratin dish (approx. 20×25 cm).
   Peel the sweet potatoes and cut them into very thin, even slices (approx. 2-3 mm thick). You can use a mandoline for this, but a sharp knife will do.
2. Prepare the Creamy Sauce (5 minutes)
   In a medium bowl, mix together the cream, milk, maple syrup (or brown sugar), salt, pepper and nutmeg.
3. Layer and Bake (1 hour)
   
   Place a thin layer of sweet potato slices in the bottom of the buttered dish, slightly overlapping each other.
   Scatter some blueberries evenly over the sweet potato layer.
   Repeat the layering (potatoes, then blueberries) until all the potatoes are used up. Finish with potatoes.
   Pour the cream mixture into the pan, covering the potatoes (but not overflowing).
   To bake: Cover the pan with foil and bake for 30-40 minutes.
   To toast: Remove the foil. Sprinkle the top with the grated cheese (if using) and bake for another 15-20 minutes, until the top is golden brown, bubbly, and the sweet potatoes are completely tender.
   Let the gratin sit for 10 minutes before serving to allow the sauce to thicken a bit.

Want another recipe that uses apples and pecans instead of blueberries with the sweet potatoes?