Middle Eastern lamb pizza

Ingredients

• 3 green onions , finely chopped
• 1/3 cup packed finely chopped mint leaves
• 1/4 cup packed finely chopped parsley
• 2 garlic cloves , minced
• 300 g lean ground lamb
• 2 tbsp tomato paste
• 1/2 tsp hot-red-chili-flakes
• 1/2 tsp salt
• 1 large thin pizza crust , about 12 inch
• 2 tbsp lemon juice
• 2 tbsp tahini
• 2 cups packed baby arugula
• 1/2 cup cherry tomatoes , halved
• 1/4 cup thinly sliced red onion