Drain, cool and peel. Mix the sausage meat with the morcilla, salt and pepper, then divide this mixture into 6 balls.
Place the egg in the center and wrap in sausage. One at a time, roll the egg in the flour, dip in beaten egg, then roll in breadcrumbs.
Heat oil, about 3 inches deep, in a pan until hot enough that a breadcrumb sizzles when dropped in. Deep-fry the eggs for 8 to 10 minutes, turning once or twice to ensure even browning. Drain on paper towels.