In a bowl, combine beef, lemon juice, soy sauce and pepper to taste. Marinate for about 30 minutes.Drain beef from marinade, squeezing any excess liquid and reserving marinade. Lay beef on a flat work surface arrange strips of carrots, chorizo, pickles and eggs lengthwise over the meat. Gently gather end of beef upwards and roll neatly into a log, enclosing the filling. With kitchen twine, tie beef roulades snugly at both ends and center to fully secure. Lightly dredge with flour.