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Ingredients

• Topping:
• 1 1/2 c fresh bread crumbs
• 2 Tbsp unsalted butter, melted
• kosher salt
• 1 Tbsp Dijon mustard
• 2 Tbsp parmigiano-reggiano, grated
• 2 tsp fresh flat-leaf parsley, chopped
• Gratin:
• 2 Tbsp unsalted, butter
• 1 c shallots, thinly sliced
• kosher salt
• 2/3 c heavy cream
• 2/3 c chicken broth
• 2 Tbsp prepared horseradish
• freshly ground black pepper
• 1 russet potato, peeled and cut in half lengthwise, thin sliced half moons
• 1 sweet potato, peeled cut in half lengthwise, thin sliced half moons
• 1/3 c parmigiano-reggiano, grated

Description

Great Side Dish.

Group Recipes