Miss-Home Mustard Hotdish

• 4 small-ish red potatoes, grated, skin on (about a pound)
• 1 small-ish white onion, diced fine
• 4 hearty stalks of celery, diced
• 1 green apple, grated, skin on
• 6 ounces sharp cheddar, grated
• 2.5 ounces parmesan, grated
• 1/2 cup creme fraiche
• 1/2 cup whole milk
• 5 tablespoons stone ground mustard
• black pepper
• salt
• butter, for your pan

1. Preheat your oven to 350u0b0 and grate! (I grate the potatoes and apple on the widest tooth option my mandolin has, but very thin.)
2. Combine the potatoes, onion, celery, apple, and onion in a large mixing bowl. I use my hands.
3. In a separate bowl, with a whisk or spatula, mixe the creme fraiche, mustard, milk, pepper and salt to taste (I go heavy on the pepper, maybe 2 tablespoons).
4. Pour the creamy stuff onto the raw stuff, and mix it. I use a spatula.
5. Into a buttered baking dish (I use a round one, but my mother uses a 9X9 and gets delicious crispy corners), pour half the the mixture. Layer half the grated cheese into the dish. Finish with a second layer of the mixture, and finish off with the cheese.
6. Bake at 350u0b0 for 55-60 minutes, until browning and bubbling.

red potatoes, white onion, celery, green apple, cheddar, parmesan, creme fraiche, milk, stone ground mustard, black pepper, salt, butter

Taken from food52.com/recipes/27136-miss-home-mustard-hotdish (may not work)