Root Vegetable Gratin

Root Vegetable Gratin

1 onion, sliced
2 cups fennel,
3 cloves garlic, minced
3 lbs mix of sweet potato, potato, celeriac
1 cup heavy cream
2 cups chicken or veg stock
2 cups grated gruyere cheese
2 tsp thyme
2 1/2 cups breadcrumbs
2 to 3 Tbsp melted butter

Peel and slice veggies 1/4" thick. Heat oven to 350°F. Butter a deep baking dish. Heat 2 Tbsp olive oil over medium heat and add the onions and fennel. Sautee about 5 minutes. Add the garlic and cook one more minute. Combine mixture with remaining vegetables, cream, stock, cheese, thyme, 1 Tbsp kosher salt and 1 1/2 tsp black pepper. Pour into baking dish. Mix breadcrumbs and butter and distribute over top of dish. Bake 1 1/2 hours uncovered, til very tender when tested with a knife. Let set 15 min and serve!

I made this for a meal train for friends who recently had a baby, and it was a big hit. Recipe and photo from Smitten Kitchen blog.