"This all-beef meatloaf has very few ingredients and a whole lot of tricks up its sleeve. Serving it with mashed potatoes is optional, but highly recommended...."
INGREDIENTS
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1/4 cup unsalted butter
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2 large yellow onions (about 10 ounces each), finely chopped
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2 English muffins
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3/4 cup cold water
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3 large eggs
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2 tablespoons ketchup, plus more for glazing
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1 tablespoon kosher salt, plus more to taste
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1 teaspoon freshly ground black pepper
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2 pounds ground beef (preferably 15 to 20% fat)