Maple-glazed Ribs

• 2 green onions
• 1 garlic clove
• 800 gr pork spareribs
• 325 gr maple syrup
• 45 ml ketchup
• 45 ml orange juice concentrate
• 30 ml soy sauce
• 16 ml dijon mustard
• 16 ml worcesterschire sauce
• 8 gr sesame seeds