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Creamy Fennel Gratin (An Easy & Elegant Side Dish!)

A beautiful plate of a homemade, elegant, and creamy Fennel Gratin, being served with a thick slice of a roasted turkey at a Thanksgiving dinner.

A simple and elegant recipe for a creamy Fennel Gratin, a perfect savory side dish for a holiday meal. This easy, one-dish recipe features thinly sliced fresh fennel tossed with Parmesan cheese and garlic directly in a baking dish. A rich mixture of heavy cream and mustard is poured over the top, and the gratin is baked for an hour until it is bubbly, tender, and golden brown on top.

Ingredients

  • 1/2 tablespoon butter, for greasing
  • 2 heads fennel, thinly sliced
  • 1 cup coarsely grated Parmesan cheese
  • 1 clove garlic, minced
  • Kosher salt
  • 1 tablespoon mustard (e.g., Dijon)
  • 2 cups heavy cream

Instructions

  1. Preheat the oven to 350°F. Butter a 9×13-inch baking dish.
  2. In the prepared baking dish, add the thinly sliced fennel, grated Parmesan, minced garlic, and 1/4 teaspoon of salt. Toss everything to combine.
  3. In a separate small bowl, whisk the mustard into the heavy cream until smooth.
  4. Pour the cream mixture evenly over the fennel mixture in the baking dish.
  5. Bake for about 1 hour, or until the gratin is bubbling and golden brown on top.
  6. Let it cool for a few minutes before serving.

Notes

  • This is a very simple ‘dump-and-bake’ style gratin where most of the mixing is done directly in the baking dish, making for very easy cleanup.
  • This rich and savory side dish is an excellent accompaniment to roasted meats like prime rib, turkey, or ham, making it ideal for Thanksgiving or Christmas dinner.
  • The recipe is naturally low-carb, keto-friendly, and gluten-free.