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Potato and Celery Root Gratin with Gruyère

Williams Sonoma
  • 135 minutes
  • Serves 10

INGREDIENTS

1 1/2 lb

Celery root

2 tsp

Chives or flat-leaf parsley, fresh

1 1/2 lb

Russet potatoes

1/2 cup

Shallots

1 tsp

Thyme, fresh

1 tsp

Dijon mustard

2 tsp

Kosher salt

1/4 tsp

Pepper, freshly ground

1 tbsp

Olive oil

1

Butter, Unsalted

2 cups

Heavy cream

1 oz

Parmigiano-reggiano cheese, grated

4 oz

Gruyère cheese, shredded