This version of Scotch eggs gets an extra kick from Dijon mustard, which is used in both the sausage mixture and the crunchy bread coating. By cooking the eggs to just soft boiled, the yolks remain deliciously creamy.
Bring a medium saucepan of water to a boil over high heat. Carefully lower 8 of the eggs into the boiling water one-by-one with a spoon and cook for 6 minutes. Prepare a bowl of ice water, then transfer the eggs to the bowl to stop the cooking process; let sit for at least 5 minutes. Carefully peel the eggs and set aside.
Meanwhile, fill a large Dutch oven or heavy pot halfway with canola oil and heat over medium-high heat to 350 degrees F.
Combine the sausage, 1/4 cup of the mustard and half the parsley in a medium bowl and mix well. Divide the sausage mixture into 8 even balls. Flatten each ball into an oval in your hand, put a peeled egg in the middle of each and wrap the sausage mixture around to completely cover.
Put the flour in a shallow dish. Crack the remaining egg into another shallow dish, add the remaining 1/4 cup mustard and beat with a fork until well combined. Put the breadcrumbs in a third shallow dish. Dip the sausage-covered eggs first in the flour, then in the egg mixture, then in the breadcrumbs to coat.
Carefully lower the coated eggs one-by-one into the hot oil with a slotted spoon (the oil temperature will drop to around 300 degrees F). Cook, adjusting the heat as needed to remain around 300 degrees F and turning the eggs to ensure even cooking, until golden brown all over and the sausage is cooked through, about 10 minutes. Transfer the eggs to a paper-towel-lined plate. Sprinkle with salt, pepper and the remaining parsley and gently roll the eggs a few times to coat. Cut each egg in half lengthwise and serve immediately with extra mustard.