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Potato Spinach Casserole

1 12 tablespoons unsalted butter, plus extra to grease the baking dish
2 teaspoons olive oil
8 ounces fresh spinach, washed, dried, and stemmed
12 lb Italian sausage, broken out of casing into small pieces (we like 1/2 sweet and 1/2 hot Italian sausage)
1 large red onion, peeled and sliced thin (about 3/4 lb)
1 small garlic clove, minced
1 12 lbs russet potatoes, peeled and cut into 1-inch chuncks (about 3 medium sized potatoes)
13 cup heavy cream
1 tablespoon cider vinegar
1 dash nutmeg
12 teaspoon salt
14 teaspoon pepper
1 cup gruyere (shredded) or 1 cup swiss cheese (shredded)


Preheat oven to 400F Butter a 6x9 or 8x8 inch baking dish. Heat one of the teaspoons of olive oil in a large skillet over medium-high heat until shimmering. Add spinach and cook, stirring often, until wilted, about 3 minutes. Transfer spinach to strainer and drain. When cool, squeeze out liquid and roughly chop the spinach. Wipe skillet clean. Add sausage to skillet and cook over medium-high heat until browned, 5 to 6 minutes. Use slotted spoon to transfer sausage to bowl. Wipe skillet clean. Heat remaining oil in skillet and add onions, cooking until golden, about 5 minutes. Add garlic and cook until fragrant, about 1 minute. Scrape mixture into bowl with sausage. Meanwhile, place potatoes in a large pot and add enough water to cover by 1 inch. Bring potatoes to boil over high heat, then lower heat to a simmer. Cook until potatoes are tender, about 15 minutes. Drain potatoes, wipe pot dry, put potatoes back into the pot, and mash with butter, cream, vinegar, nutmeg, salt and pepper. Stir in spinach and 1/2 cup of the cheese. Transfer potato-spinach mixture to prepared baking dish. Top with sausage-onion mixture and sprinkle with remaining 1/2 cup of cheese. Bake until potatoes are very hot and cheese is golden and bubbly, 20 to 25 minutes. Cool for 10 minutes before serving.

Source: www.food.com