Combine ground beef, onion, oil, salt, coriander, cumin, cinnamon, allspice and mint leaves in a large bowl, mixing lightly but thoroughly.
Shape quarter of beef mixture around 8-inch bamboo skewers leaving approximately 1 to 2 inches at bottom of skewer. Make small indentations in beef mixture with fingers approximately 1 inch apart along the kofta. Repeat with remaining beef mixture and 3 skewers.
Refrigerate beef at least 10 minutes.
Place koftas in center of grid over medium, ash-covered coals. Grill, uncovered, 12 to 14 minutes or until instant-read thermometer inserted horizontally into thickest part of koftas registers 160°F, turning occasionally.
Nutrition information per serving: 216 Calories; 108 kcal Calories from fat; 12 g Total Fat; 4 g Saturated Fat; 6 g Monounsaturated Fat; 84 mg Cholesterol; 264 mg Sodium; 2 g Total Carbohydrate; 0.6 g Dietary Fiber; 26 g Protein; 3 mg Iron; 6.2 mg Niacin; 0.4 mg Vitamin B6; 2.8 mcg Vitamin B12; 6.4 mg Zinc; 21 mcg Selenium; 71.25 mg Choline;