03Preheat the oven to 350 degrees F. Heat about 3 inches of grapeseed oil in a small high-sided saucepan over medium-high heat until a deep-fry thermometer reads 325 degrees F (or until a pinch of panko sizzles in the oil). Season the flour with 1/2 teaspoon each salt and pepper in a shallow dish. Beat the remaining egg with the milk in another shallow dish. Put the panko in a third shallow dish.04Roll the sausage-covered eggs in the seasoned flour, shaking off the excess. Transfer to the egg-milk mixture and turn to completely coat. Let the excess egg drip off, then roll in the panko.05Fry the eggs until golden brown, about 3 minutes. Remove to a baking sheet, transfer to the oven and bake until the sausage is cooked through, 10 to 12 minutes. Mix the mayonnaise, mustard and lemon juice in a small bowl. Serve with the Scotch eggs.