In a large bowl, mix together ground beef, onion, raisins, and parsley. Season with cayenne pepper, cinnamon, coriander, nutmeg, sugar, salt, and pepper, and mix well. Form into 6 flat sausages around skewers. Lightly brush sausages with oil; this prevents sticking to the grill.
Arrange skewers on hot grill grate. Cook for approximately 15 minutes, turning occasionally to brown evenly, until well done.