10 mind-blowing uses for mustard that don't involve fast food

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Potato tortilla

Potato tortillas are those thick egg-and-potato omelets that originated in Spain. To make them express, cut up potatoes and onions into thin rounds, and brown them in a covered skillet. In a bowl, beat the eggs, add a heaping spoonful of mustard, and season with salt and pepper. Pour the egg mixture over the potatoes and onions (preferably in a high-sided skillet). Cook for about 10 minutes on low, flipping the tortilla halfway through.