Root Vegetable Gratin with Mustard Cream

SIPPITYSUP
12Ingredients
65Minutes

Ingredients

US|METRIC
  • unsalted butter (as needed for baking dish)
  • 2 teaspoons yellow mustard seeds (whole, divided)
  • 2 pounds root vegetables (assorted, such as sweet potatoes, celery root, and rutabega, peeled and very thinly sliced)
  • 2 cloves garlic (peeled, whole)
  • 2 cups whole milk
  • 2 cups water
  • 1 cup cream
  • 1 tablespoon Dijon mustard
  • kosher salt (to taste)
  • ground white pepper (to taste)
  • 2 tablespoons flour (all-purpose)
  • 6 ounces Emmental cheese (grated, or similar)
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