Broccoli Gratin - Giant Malaysia

Ingredients

• 1 pc Small onion, chopped
• 1 tbsp Olive Oil
• 2 tbsp All-Purpose Flour
• 3/4 tbsp Salt
• 1/4 tbsp Black Pepper
• 1/2 tbsp Rubbed Sage
• 1 1/2 tbsp Whole Milk
• 1 sprig Curry Leaves
• 900g Broccoli, chopped
• 1 1/2 cups Cantal/Cheddar Cheese, shredded
• 3 tbsp Butter, melted
• 1 cup Bread Crumbs
• 1 cup Parmesan Cheese